osmesa: mklib requires arguments before objects

osmesa: mklib requires arguments before objects

Fixes the build when selecting driver=osmesa and building static libraries.
Otherwise, mklib tries to add the ‘-ltalloc’ object to the archive, which
obviously fails.

Clients which statically link to osmesa will need to link to libtalloc also,
as specified in the Libs.private of osmesa.pc.

Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=33360

NOTE: This is a candidate for the 7.10 branch.

Signed-off-by: Christopher James Halse Rogers <christopher.halse.rogers@canonical.com>
Signed-off-by: Brian Paul <brianp@vmware.com>