mapi: print function declarations for shared glapi

mapi: print function declarations for shared glapi

Earlier commit aimed to remove unneeded function declarations. Namely
OpenGL entrypoints which are not applicable for OpenGLES*

Although it did not consider the shared glapi which needs all,
including hidden ones. Resulting in warning/errors like the following

../build/src/mapi/shared-glapi/glapi_mapi_tmp.h:26014:15:
error: no previous prototype for ‘shared_dispatch_stub_1414’ [-Werror=missing-prototypes]

This patch addressed that.

Cc: Erik Faye-Lund <erik.faye-lund@collabora.com>
Reported-by: Eric Anholt <eric@anholt.net>
Fixes: 6148cce388f ("mapi: drop unneeded gl_dispatch_stub declarations")
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Acked-by: Eric Anholt <eric@anholt.net>