glx: automake: scons: remove unneeded GLX_SHARED_GLAPI define

There's no users in-tree that use it.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/glx/SConscript

@@ -40,9 +40,6 @@ if env['HAVE_XF86VIDMODE']:
     env.Append(CPPDEFINES = ['XF86VIDMODE'])
     env.PkgUseModules('XF86VIDMODE')
 
-if False: # XXX: SHARED_GLAPI
-    env.Append(CPPDEFINES = ['GLX_SHARED_GLAPI'])
-
 sources = [
     'clientattrib.c',
     'clientinfo.c',