exit on error inside the README EOL conversion for loop r=bsmedberg b=351476

browser/locales/Makefile.in

@@ -128,6 +128,7 @@ PROFILE_CHROME = userChrome-example.css userContent-example.css
 
 libs:: $(addprefix $(LOCALE_SRCDIR)/,$(README_FILES))
 ifeq ($(OS_ARCH),WINNT)
+	$(EXIT_ON_ERROR) \
 	for file in $^; do \
 	  $(PERL) -pe 's/(?<!\r)\n/\r\n/g;' < $$file > $(FINAL_TARGET)/`basename $$file`; \
 	done