Buildsystem/Windows: Enable multihreaded compiling on MSVC > version 7 (report issues if any) - thanks to Leak for the heads up

--HG--
branch : trunk

CMakeLists.txt

@@ -288,6 +288,8 @@ if( MSVC )
   if(CMAKE_SIZEOF_VOID_P MATCHES 4)
     set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /LARGEADDRESSAWARE")
   endif()
+  # Multithreaded compiling on VS
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /MP")
 endif()
 
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