CMake/Buildsystem: Fix a small compiler-problem when using PCH with MSVC - the /Ym flag is adjusted by the compiler in MSVC2012, hence we need to set an upper limit to avoid disrupancies

Please note that this is not 'very well tested'.

cmake/compiler/msvc/settings.cmake

@@ -50,3 +50,7 @@ if(NOT WITH_WARNINGS)
     message(STATUS "MSVC: Disabled generic compiletime warnings")
   endif()
 endif()
+
+# Specify Precompiled Header Memory Allocation Limit
+# (Fix a compiler-problem when using PCH - the /Ym flag is adjusted by the compiler in MSVC2012, hence we need to set an upper limit to avoid disrupancies)
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /Zm500")