VS: Simplify MSVC version reporting

Teach Windows-cl.cmake to use CMAKE_(C|CXX)_COMPILER_VERSION to set the
"MSVC##" and MSVC_VERSION variables.  It no longer needs the IDE generator
to dictate the version or to detect the version by running the
command-line tool for NMake and Ninja generators.  Drop configuration of
CMakeCPlatform.cmake and CMakeCXXPlatform.cmake from Windows-cl.cmake.in
because all the results it saved are now cheap to compute every time.

1 files changed, 0 insertions, 1 deletions

diff --git a/Source/cmGlobalVisualStudio6Generator.cxx b/Source/cmGlobalVisualStudio6Generator.cxx
index ca06b66..e8ca788 100644
--- a/Source/cmGlobalVisualStudio6Generator.cxx
+++ b/Source/cmGlobalVisualStudio6Generator.cxx
@@ -32,7 +32,6 @@ std::string GetVS6TargetName(const std::string& targetName)
 
 cmGlobalVisualStudio6Generator::cmGlobalVisualStudio6Generator()
 {
-  this->VersionId = "MSVC60";
   this->FindMakeProgramFile = "CMakeVS6FindMake.cmake";
 }