The hash_fun.hxx header is configured whether FundamentalType is enabled
or not and so cannot depend on it.  Run the relevant platform tests
whether or not FundamentalType is on and configure the result directly
into hash_fun.  While at it, remove the dependence of SystemInformation
on FundamentalType too since it needs only information that we now
always compute.

Borland ignores "const" qualifiers in template specializations.

Added hashing fuction for std::string.  This adds default support for
std::strings to KWSys hashing containers.

Author: Bradley Lowekamp <blowekamp@mail.nih.gov>
Suggested-by: Arnaud Gelas <arnaud_gelas@hms.harvard.edu>
Change-Id: I7e7a0c356b73d19868a3df1db57b702ec7fffe9d

For the specialization of hash<>(), the types long long and __int64
may be the same type. While the CMakeLists indicate that if __int64 is
a alias for another type the it will not be enabled, on mingw they
both appear to be the same type and enabled.

This patch only enable specialization for long long OR __int64 to
avoid the potential conflict.

Author: Bradley Lowekamp <blowekamp@mail.nih.gov>
Change-Id: I813a9ac008b296fab5a369c48e6dd5460fd0c035

Added hash function for types long long and __int64, conditional on
detection by FundamentalType.

Author: Bradley Lowekamp <blowekamp@mail.nih.gov>
Change-Id: Ie273f55cd4387ca3dbbe00b9d96ad4935e456c9e

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.

COMP: Added KWSYS_CXX_HAS_CSTDDEF try-compile to KWSys to provide kwsys/cstddef header (to get size_t for hash_fun.hxx).

ENH: Adding SGI hash_map and hash_set implementation ported from STL to KWSys.  This also adds try-compiles for KWSYS_STL_HAS_ALLOCATOR_REBIND, KWSYS_CXX_HAS_FULL_SPECIALIZATION, KWSYS_CXX_HAS_MEMBER_TEMPLATES, and KWSYS_CXX_HAS_NULL_TEMPLATE_ARGS.