Currently, the Mercurial revision information is not appearing in Windows builds - they always appear to be "default". This appears to be because the relevant information is not passed to getbuildinfo.c.

The attached patch rectifies this, making the assumption that "hg" will always be accessible on the path. The basic method is to call "hg id -bit" and then pass the branch, tag and revision information when compiling getbuildinfo.c.

If "hg" is not in the path, no Mercurial information is added (i.e. the current behaviour).