Fix lint-stable checkin hooks on MacOS X

- wc adds a number of leading spaces which broke cut
- sed can't replace spaces with new lines, so use tr for that.
- make sure directories are created if they're not there.

Change-Id: Ia0db059683abe3d97b0ab6feaece660a1f4e5079
Signed-off-by: Stefan Reinauer <reinauer@google.com>
Reviewed-on: http://review.coreboot.org/774
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)

Makefile.inc

@@ -225,7 +225,7 @@ lint lint-stable:
 		grep "^# DESCR:" $$script | sed "s,.*DESCR: *,," ; \
 		echo ========; \
 		$$script > $$LINTLOG; \
-		if [ `wc -l $$LINTLOG | cut -d' ' -f1` -eq 0 ]; then \
+		if [ `echo $$( wc -l $$LINTLOG ) | cut -d' ' -f1` -eq 0 ]; then \
 			printf "success\n\n"; \
 		else \
 			echo test failed: ; \