The check for _MSC_VER here is not necessary here because:
-One cannot compile GLib out-of-the-box with VS 2003 (let alone VS6
 or earlier) since GLib 2.22.4 or so.
-This code compiles fine with the currently-supported VS versions
 (2008/2010) without the error mentioned in the comments.

This will close Bug 652002.