Revert last delta, sys/conf/kern.pre.mk,v 1.33 does the job.

OK'ed by:	scottl

release/Makefile

@@ -1051,8 +1051,7 @@ doMFSKERN:
 	cd ${.CURDIR}/..; \
 	KERNEL_KO=BOOTMFS KODIR= \
 	    ${CROSSMAKE} ${KERNEL_FLAGS} -DNO_MODULES -DNO_KERNELCLEAN \
-	    KERNCONF=BOOTMFS COPTFLAGS="-Os -fno-strict-aliasing -pipe" \
-	    -DNO_CPU_COPTFLAGS \
+	    KERNCONF=BOOTMFS COPTFLAGS="-Os -pipe" -DNO_CPU_COPTFLAGS \
 	    buildkernel reinstallkernel \
 	    DESTDIR=${RD}/kernels
 	[ -r ${.CURDIR}/../sys/${TARGET}/conf/BOOTMFS.hints ] && \