Include opt_global.h in the modules build, when building from a normal

kernel build.  This makes it possible for me not to get pissed off that
random.ko crashes the system trying to rdtsc() when the i386/cpu.h
support code decides it's okay to call that op when neither I386_CPU or
I486_CPU is defined.  I guess it also makes WITNESS/INVARIANTS defines
get picked up by the modules.

sys/conf/kern.post.mk

@@ -13,6 +13,7 @@
 .if defined(DESTDIR)
 MKMODULESENV+=	DESTDIR="${DESTDIR}"
 .endif
+MKMODULESENV+=	KERNBUILDDIR="${.CURDIR}"
 
 .MAIN: all
 

sys/conf/kmod.mk

@@ -79,6 +79,9 @@ CFLAGS+=	-DKLD_MODULE
 # add to the front of `make' variable.
 _ICFLAGS:=	${CFLAGS:M-I*}
 CFLAGS+=	-nostdinc -I- ${INCLMAGIC} ${_ICFLAGS}
+.if defined(KERNBUILDDIR)
+CFLAGS+=       -include ${KERNBUILDDIR}/opt_global.h
+.endif
 
 # Add -I paths for system headers.  Individual KLD makefiles don't
 # need any -I paths for this.  Similar defaults for .PATH can't be