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Run the `clang-format.bash` script to update all our C and C++ code to a
new style defined by `.clang-format`.  Use `clang-format` version 6.0.

* If you reached this commit for a line in `git blame`, re-run the blame
  operation starting at the parent of this commit to see older history
  for the content.

* See the parent commit for instructions to rebase a change across this
  style transition commit.

Remove code that gives the preprocessor trouble when `_FILE_OFFSET_BITS`
is not defined, e.g. on 32-bit machines.  It was behind `#if 0` anyway.

Run the `clang-format.bash` script to update all our C and C++ code to a new
style defined by `.clang-format`.  Use `clang-format` version 3.8.

* If you reached this commit for a line in `git blame`, re-run the blame
  operation starting at the parent of this commit to see older history
  for the content.

* See the parent commit for instructions to rebase a change across this
  style transition commit.

Change-Id: Ie3aedc03bfe5c3999d4a077fafb8c6f3bbffc5c5

Per-source copyright/license notice headers that spell out copyright holder
names and years are hard to maintain and often out-of-date or plain wrong.
Precise contributor information is already maintained automatically by the
version control tool.  Ultimately it is the receiver of a file who is
responsible for determining its licensing status, and per-source notices are
merely a convenience.  Therefore it is simpler and more accurate for
each source to have a generic notice of the license name and references to
more detailed information on copyright holders and full license terms.

Our `Copyright.txt` file now contains a list of Contributors whose names
appeared source-level copyright notices.  It also references version control
history for more precise information.  Therefore we no longer need to spell
out the list of Contributors in each source file notice.

Replace KWSys per-source copyright/license notice headers with a short
description of the license and links to `Copyright.txt` and online
information available from "https://cmake.org/licensing#kwsys".

Run the `filter-notices.bash` script to perform the replacements mechanically.
Manually fix up the shebang line in one file.

Change-Id: I8497f7c868664dcf54a8608ab302ad93c860b334

As described in the issues below, Embarcadero compilers emit a spurious warning
when including windows.h, if compiling with the C (not C++) language.

    http://qc.embarcadero.com/wc/qcmain.aspx?d=104595
    [BCC32 Warning] winnt.h(14966)...

    http://qc.embarcadero.com/wc/qcmain.aspx?d=127681
    Annoying warnings upon inclusion of <windows.h> in .C source file

Change-Id: Ie8014edea7e8bbdd76f4555ec2d6cd6d90490032

Define macros

 _CRT_NONSTDC_NO_DEPRECATE
 _CRT_SECURE_NO_DEPRECATE
 _CRT_SECURE_NO_WARNINGS
 _SCL_SECURE_NO_DEPRECATE

for all translation units in KWSys.  Drop definitions from Configure.h
that are now redundant.

Change-Id: I326a1edb6c5a8ab977ecd2370eed6fcdf4775208

When kwsys is built using GCC visibility support can be used. This is similar
to the way that Windows exports symbols in DLLs, and requires projects that
build kwsys to change the default visibility using some compiler flags. See
http://gcc.gnu.org/wiki/Visibility for more details about GCC visibility.

We suppress Intel warning 1572 because the cases where we do equality
tests are valid.  Since this project does not do numerical computations
we need not worry about real instances against which this warning
protects.

This converts the KWSys license to a pure 3-clause OSI-approved BSD
License.  We drop the previous license clause requiring modified
versions to be plainly marked.  We also update the KWSys copyright to
cover the full development time range.

This disables Borland warning 8027 while compiling KWSys source files.
It provides no useful information.

All KWSys C symbol names begin with the KWSYS_NAMESPACE defined at
configuration time.  For ease of editing we write canonical names with
the prefix 'kwsys' and use macros to map them to the configured prefix
at preprocessing time.  In the case of standalone KWSys, the prefix is
'kwsys', so the macros were previously defined to their own names.

We now skip defining the macros in the identity case so that the final
symbol names are never themselves macros.  This will allow the symbols
to be further transformed behind the scenes to help linkers in special
cases on some platforms.

COMP: Second try getting rid of Microsoft deprecation warnings. This time tested from KWStyle with vs8 to make sure the warnings are really gone. Remove the deprecation defs from CMakeLists and guard the defs in the header so we do not redefine them if they are already defined.

COMP: Suppress Microsoft deprecation warnings when building kwsys .c and .cxx files. This way, other projects that include kwsys will not see the warnings in kwsys .c and .cxx files, but they can still see the warnings in their own source files if they want to...

ENH: Separate the notion of a request for LFS and its availability.  Allow user code to block definitions of LFS macros.  Added framework to give error if sys/types.h is included before this header when LFS is requested (currently disabled).

ENH: Moved kwsys_ns and kwsysEXPORT macros to Configure.h in the case of building a kwsys source file.  This allows more than one header to be included in a kwsys source file without redefining the macros.

ENH: Added wrappers around the std stream headers to make them look like ansi streams on all platforms.