glx/xlib: Handle glXCreateContextAttribsARB in glXGetProcAddress.

src/gallium/state_trackers/glx/xlib/glx_getproc.c

@@ -168,6 +168,9 @@ static struct name_address_pair GLX_functions[] = {
    /*** GLX_ARB_get_proc_address ***/
    { "glXGetProcAddressARB", (__GLXextFuncPtr) glXGetProcAddressARB },
 
+   /*** GLX_ARB_create_context ***/
+   { "glXCreateContextAttribsARB", (__GLXextFuncPtr) glXCreateContextAttribsARB },
+
    /*** GLX_EXT_texture_from_pixmap ***/
    { "glXBindTexImageEXT", (__GLXextFuncPtr) glXBindTexImageEXT },
    { "glXReleaseTexImageEXT", (__GLXextFuncPtr) glXReleaseTexImageEXT },