gbm: use new symbols check script

Note: the list in gbm-symbols.txt is the same as the one that was in
gbm-symbols-check, I just took the opportunity to sort it.

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by Dylan Baker <dylan@pnwbakers.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
2 files changed