Help: Document unsupported compilers in the release notes.

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+unsupported-compilers
+---------------------
+
+* The implementation of CMake relies on some C++ compiler features which are
+  not supported by some older compilers.  As a result, those old compilers
+  can no longer be used to build CMake itself.  CMake continues to be able to
+  generate Makefiles and project files for users of those old compilers
+  however.  The compilers known to no longer be capable of building CMake
+  are:
+
+  * MSVC 6 and 7.0 - superceded by VisualStudio 7.1 and newer compilers.
+  * GCC 2.95 - superceded by GCC 3 and newer compilers.
+  * Borland compilers - superceded by other Windows compilers.
+  * Compaq compilers - superceded by other compilers.
+  * Comeau compilers - superceded by other compilers.
+  * SGI compilers - IRIX was dropped as a host platform.
+
+  When building using SolarisStudio 12, the default ``libCStd`` standard
+  library is not sufficient to build CMake.  The SolarisStudio distribution
+  supports compiler options to use ``STLPort4`` or ``libstdc++``.  An
+  appropriate option to select the standard library is now added
+  automatically when building CMake with SolarisStudio compilers.