The detection logic added by commit v3.8.0-rc2~14^2 (VS2017: If Win 8.1
SDK is not available, use Win 10 SDK, 2017-02-20) was incomplete.  It is
possible for the Win 8.1 SDK registry entry to exist, and even the
directory, but the header files to not actually be installed.  Teach
`cmGlobalVisualStudio15Generator::IsWin81SDKInstalled` to verify that
the `windows.h` header actually exists in the SDK directory.  We do this
in `cmGlobalVisualStudio14Generator::GetWindows10SDKVersion` for the
Windows 10 SDK already.

Fixes: #16811

This are searched for in the default installed location
C:/local/boost_${ver}

Cherry picked from commit 862482df
for backport to CMake 3.8.

This is to permit VS2017 to make use of the vc141 suffix or
fall back to the compatible vc140 to use Boost libraries built
with VS2015.

Cherry picked from commit 3ca6f70f
plus a fixup from commit 6115875b
for backport to CMake 3.8.

Boost 1.64 now names the library directory `14.1`, not `15.0`.

Also raise an error if files are given that are not below the root.

Fixes: #16807

Set `CMP0017` to `NEW` so that when FindKDE4 sets `CMAKE_MODULE_PATH` it
does not break internal dependencies of other find modules.

Fixes: #16823

Missing documentation for an already existing
CPackRPM source rpm packages feature.

Fixes #16814

The braces around project reference GUIDs for vcxproj projects were
apparently optional in the past, but Visual Studio 2017 is more strict,
displaying a warning, and not displaying project reference properties
unless the braces are present.

Fixes: #16820

Since commit v3.8.0-rc1~136^2 (FindBoost: Search official location of
prebuilt binaries on Windows, 2016-12-21) we pass input paths through
`_Boost_UPDATE_WINDOWS_LIBRARY_SEARCH_DIRS_WITH_PREBUILT_PATHS` in more
places than before.  This broke tolerance of backslashes in paths
provided by the user due to the macro argument re-parsing.  Turn
`_Boost_UPDATE_WINDOWS_LIBRARY_SEARCH_DIRS_WITH_PREBUILT_PATHS` into a
function instead of macro to avoid re-parsing of macro arguments.

Fixes: #16816

Add names found in OpenSSL 1.1.0 builds from [1].

[1] https://www.npcglib.org/~stathis/blog/precompiled-openssl/

These were added by commit v3.8.0-rc4~4^2~1 (RC: Add missing
CMAKE_RC_FLAGS_<CONFIG> entries to cache, 2017-03-28) and should be
advanced as they are for other languages.

Closes: #16556

Variable CMAKE_CROSSCOMPILING_EMULATOR is used to initialize
CROSSCOMPILING_EMULATOR.

Issue: #16785

Closes: #16784

Changes:
- Fix install script template (*.qs.in) to register on all platforms;
- Add patch version numter to display name ("CMake X.Y" -> "CMake X.Y.Z").

Latest wxWidgets git master version and the upcoming 3.1.1 release requires
linking with shlwapi and version DLLs. As this does no harm when using the
previous versions, just do it unconditionally.

Avoid writing any files to the source tree during testing.

Fixes: #16770

The `ld` tool in Xcode 8.3 now has a `-lto_library <path>` flag.  Ignore
the flag instead of accidentally parsing it as `-l` with `to_library`.

Fixes: #16766