glapi: Fix build break in 'make check' on non-shared-glapi builds

glapi: Fix build break in 'make check' on non-shared-glapi builds

Commit fb78fa58 made the GL_ARB_debug_output functions aliases of the
GL_KHR_debug output functions.  As a result, the function names in
struct _glapi_table also changed.  The table in check_table.cpp used the
ARB names.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Timothy Arceri <t_arceri@yahoo.com.au>
Tested-by: Brian Paul <brianp@vmware.com>
Tested-by: Lu Hua <huax.lu@intel.com>
Cc: Vinson Lee <vlee@freedesktop.org>