Add code (copied from libGL) for detecting if Mesa is 9.1.7 or 10.3+.
If Mesa 9.1.7 is found remove the gbm version from configure and rollback
the commit that caused the version to be bumped.
This allows 9.x and 10.0-R to have GNOME 3.


git-svn-id: svn://creme-brulee.marcuscom.com/ports/trunk@20040 df743ca5-7f9a-e211-a948-0013205c9059