autotools, cmake: test Xfixes along with XInput2.h:

because we use Xfixes with XIBarrierReleasePointer

configure

@@ -21502,8 +21502,10 @@ fi
 
             if test x$enable_video_x11_xfixes = xyes; then
                 definitely_enable_video_x11_xfixes=no
+                # check along with XInput2.h because we use Xfixes with XIBarrierReleasePointer
                 ac_fn_c_check_header_compile "$LINENO" "X11/extensions/Xfixes.h" "ac_cv_header_X11_extensions_Xfixes_h" "#include <X11/Xlib.h>
-
+                                 #include <X11/Xproto.h>
+                                 #include <X11/extensions/XInput2.h>
 "
 if test "x$ac_cv_header_X11_extensions_Xfixes_h" = xyes; then :
   have_xfixes_h_hdr=yes