mesa_glinterop: remove mesa_glinterop typedefs

mesa_glinterop: remove mesa_glinterop typedefs

As is there are two places that do the typedefs - dri_interface.h and
this header. As we cannot include the former in here, just drop the
typedefs and use the struct directly (as needed).

This is required because typedef redefinition is C11 feature which is
not supported on all the versions of GCC used to build mesa.

v2: Kill the typedef alltogether, as per Marek.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96236
Cc: Vinson Lee <vlee@freedesktop.org>
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>