mesa: Remove out-dated comment in common_x86.c

Follow up: 8e3696137f ("remove final imports.h and imports.c bits")

Signed-off-by: Yonggang Luo <luoyonggang@gmail.com>
Acked-by: Brian Paul brianp@vmware.com
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19472>

src/mesa/x86/common_x86.c

@@ -34,7 +34,6 @@
  * \author Andre Werthmann <wertmann@cs.uni-potsdam.de>
  */
 
-/* XXX these includes should probably go into imports.h or glheader.h */
 #if defined(USE_SSE_ASM) && defined(__FreeBSD__)
 #include <sys/types.h>
 #include <sys/sysctl.h>