Merge topic 'doc-compilers-dropped'

27c51865 Help: Add release note about compilers that no longer build CMake itself

Help/release/dev/doc-compilers-dropped.rst

+doc-compilers-dropped
+---------------------
+
+* Support for building CMake itself with some compilers was dropped:
+
+  * Visual Studio 7.1 and 2005 -- superseded by VS 2008 and above
+  * MinGW.org mingw32 -- superseded by MSYS2 mingw32 and mingw64
+
+  CMake still supports generating build systems for other projects using
+  these compilers.