Include opt_compat.h, so that COMPAT_LINUX32 is defined, and we can

access to the semop structs and functions.

Submitted by:	cognet@

Differential Revision:	https://reviews.freebsd.org/D1095
Reviewed by:	trasz

sys/amd64/linux32/linux32_machdep.c

@@ -31,6 +31,8 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
+#include "opt_compat.h"
+
 #include <sys/param.h>
 #include <sys/kernel.h>
 #include <sys/systm.h>