WITH_META_MDE: Fix machine/include and x86/include issues.

- Fixes 'ln: File exists' errors.
- Fixes creating include directories in the source directory as well.

Sponsored by:	EMC / Isilon Storage Division

sys/conf/kern.post.mk

@@ -285,7 +285,7 @@ ${_ILINKS}:
 		path=${S}/${.TARGET}/include ;; \
 	esac ; \
 	${ECHO} ${.TARGET} "->" $$path ; \
-	ln -s $$path ${.TARGET}
+	ln -fhs $$path ${.TARGET}
 
 # .depend needs include links so we remove them only together.
 kernel-cleandepend: .PHONY

sys/conf/kmod.mk

@@ -287,7 +287,7 @@ ${_ILINKS}:
 	esac ; \
 	path=`(cd $$path && /bin/pwd)` ; \
 	${ECHO} ${.TARGET:T} "->" $$path ; \
-	ln -sf $$path ${.TARGET:T}
+	ln -fhs $$path ${.TARGET:T}
 
 CLEANFILES+= ${PROG} ${KMOD}.kld ${OBJS}