Fix the contrib for files and dirs with spaces

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>
(cherry picked from commit 8df85173)
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

extras/contrib/Makefile

@@ -56,8 +56,8 @@ using-bin: contrib-macosx-$(ARCH)-$(CONTRIBREV).tar.bz2
 	mkdir tmp
 	(cd tmp && tar jxvf ../$<)
 	./change_prefix.sh tmp @@CONTRIB_PREFIX@@  $(PREFIX)
-	for dir in `(cd tmp && find . -type d)`; do mkdir -p -- $$dir; done
-	for i in `(cd tmp && find . -not -type d)`; do mv -f tmp/$$i $$i; done
+	(cd tmp && find . -type d) | while read dir; do mkdir -p -- "$$dir"; done
+	(cd tmp && find . -not -type d) | while read i; do mv -f -- tmp/"$$i" "$$i"; done
 	rm -rf tmp
 endif