Revert "Always build shared glapi"

This reverts commit adefee50d9.

Shared glapi was never tested with --enable-xlib-glx and turns out
to cause a lot of problems.

Conflicts:

	configure.ac

src/mapi/glapi/gen/glX_proto_send.py

@@ -361,6 +361,8 @@ const GLuint __glXDefaultPixelStore[9] = { 0, 0, 0, 0, 0, 0, 0, 0, 1 };
 					procs[n] = func.static_glx_name(n)
 
 		print """
+#ifdef GLX_SHARED_GLAPI
+
 static const struct proc_pair
 {
    const char *name;
@@ -394,6 +396,8 @@ __indirect_get_proc_address(const char *name)
 
    return (pair) ? pair->proc : NULL;
 }
+
+#endif /* GLX_SHARED_GLAPI */
 """
 		return
 
@@ -1047,7 +1051,9 @@ extern _X_HIDDEN NOINLINE FASTCALL GLubyte * __glXSetupVendorRequest(
 					break
 
 		print ''
+		print '#ifdef GLX_SHARED_GLAPI'
 		print 'extern _X_HIDDEN void (*__indirect_get_proc_address(const char *name))(void);'
+		print '#endif'
 
 
 def show_usage():