Windows: Fill ProductVersion of blender executable

On windows, the ProductVersion field of the blender executable was empty,
see [1] for more information. This field might be required by windows
tools such as SCCM agent to track usage statistics.

It seems that it was due to the BLEN_VER_RC_STR macro used in
winblender.rc not being a string.

[1] https://docs.microsoft.com/en-us/windows/win32/menurc/versioninfo-resource

Differential Revision: https://developer.blender.org/D5896

source/creator/CMakeLists.txt

@@ -133,7 +133,7 @@ if(WIN32 AND NOT UNIX)
   string(SUBSTRING ${BLENDER_VERSION} 2 1 bver2)
   string(SUBSTRING ${BLENDER_VERSION} 3 1 bver3)
   add_definitions(
-    -DBLEN_VER_RC_STR=${BLENDER_VERSION}
+    -DBLEN_VER_RC_STR="${BLENDER_VERSION}"
     -DBLEN_VER_RC_1=${bver1}
     -DBLEN_VER_RC_2=${bver2}
     -DBLEN_VER_RC_3=${bver3}