glapi: Remove static dispatch for functions that didn't exist in 10.4

glapi: Remove static dispatch for functions that didn't exist in 10.4

Comparing the output of

    nm libGL.so | grep ' T gl[^X]' | sed 's/.* T //'

between 10.4.7 and this commit, the only change is the removal of
glFramebufferTextureFaceARB.  This function was removed a couple commits
previously.

None of these functions are particuarly new.  If applications were not
statically linking them with 10.4.7, there's approximately zero chance
they will for 10.6.

Almost all of these functions are for GL_ARB_direct_state_access.
Since the whole DSA API wasn't statically exported (and the extension
wasn't enabled!), I think there's exactly zero chance anyone linked
against these symbols.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>