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

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

Comparing the output of

    nm -D arch/x86_64/usr/X11R6/lib64/fglrx/fglrx-libGL.so.1.2 |\
        grep ' T gl[^X]' | sed 's/.* T //'

between Catalyst 14.6 Beta and this commit, the only change is a bunch
of functions that AMD exports that Mesa does not and some OpenGL ES
1.1 functions that Mesa exported but AMD does not.

The OpenGL ES 1.1 functions (e.g., glAlphaFuncx) are added by extensions
in desktop.  Our infrastructure doesn't allow us to statically export a
function in one lib and not in another.  The GLES1 conformance tests
expect to be able to link with these functions, so we have to export
them.

If a function is not statically exported by either of the major binary
drivers on Linux, there is almost zero chance that any application
statically links with it.

As a side note... I find it odd that AMD exports glTextureBarrierNV but
not glTextureBarrier.

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