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: 6148cce388 ("mapi: drop unneeded gl_dispatch_stub declarations")
Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>
Acked-by: Eric Anholt <eric@anholt.net>

src/mapi/mapi_abi.py

@@ -265,7 +265,7 @@ class ABIPrinter(object):
             if not self.need_entry_point(ent):
                 continue
             export = self.api_call if not ent.hidden else ''
-            if not ent.hidden:
+            if not ent.hidden or not self.lib_need_non_hidden_entries:
                 decls.append(self._c_decl(ent, prefix, True, export) + ';')
 
         return "\n".join(decls)