[MSBuild integration] correct version number in path lib/clang

[Farwaykorse]

Summary

Correcting the path to the Clang libraries.
I believe the path change to be a result of rC281666: "Simplify Clang's version number configuration in CMake."

tools/msbuild/CMakeLists.txt

 if (MSVC)
   # CPack will install a registry key in this format that we wish to reference.
   set(REG_KEY "${CPACK_PACKAGE_INSTALL_REGISTRY_KEY}")
-  set(LIB_PATH_VERSION "${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}")
+  set(LIB_PATH_VERSION "${LLVM_VERSION_MAJOR}.${LLVM_VERSION_MINOR}.${LLVM_VERSION_PATCH}")
 
   foreach (platform "Win32" "x64")
     set(prop_file_in "Microsoft.Cpp.Win32.llvm.props.in")
     set(prop_file_v100 "Microsoft.Cpp.${platform}.LLVM-vs2010.props")
     set(prop_file_v110 "Microsoft.Cpp.${platform}.LLVM-vs2012.props")
     set(prop_file_v110_xp "Microsoft.Cpp.${platform}.LLVM-vs2012_xp.props")
     set(prop_file_v120 "toolset-vs2013.props")
     set(prop_file_v120_xp "toolset-vs2013_xp.props")