glx: Create proper server dependency for GLX_EXT_create_context_es2_profile

Previously GLX_EXT_create_context_es2_profile was marked as "direct
only" so that it would not depend on server support.  Since the
extension required functions that are part of
GLX_ARB_create_context_profile, support for the EXT was disabled if the
ARB was not supported.

This was complete rubbish.  If the server supported the ARB but not the
EXT, sending a request with GLX_CONTEXT_ES2_PROFILE_BIT_EXT would result
in GLXBadProfileARB.

Instead of the misguided hack, make GLX_EXT_create_context_es2_profile
properly depend on server support by not marking it as "direct only."

Signed-off-by: Ian Romanick <[email protected]>
Acked-by: José Fonseca <[email protected]>
Reviewed-by: Chad Versace <[email protected]>
Cc: Emil Velikov <[email protected]>

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