Fix make install, patch from crispin@flowerday.cx. b=272151

layout/html/document/src/Makefile.in

@@ -96,7 +96,7 @@ GARBAGE		+= $(addprefix $(DIST)/bin/res/,$(_FILES)) $(DIST)/bin/res/ua.css
 FORMS_CSS_SRC = $(srcdir)/forms.css
 PREPROCESS_FORMS_CSS = $(PERL) $(MOZILLA_DIR)/config/preprocessor.pl $(DEFINES) $(ACDEFINES) $(FORMS_CSS_SRC)
 
-$(DIST)/bin/res/forms.css $(DESTDIR)$(mozappdir)/res/form.css: $(FORMS_CSS_SRC) Makefile
+$(DIST)/bin/res/forms.css $(DESTDIR)$(mozappdir)/res/forms.css: $(FORMS_CSS_SRC) Makefile
 	if test ! -d $(@D); then rm -rf $(@D); $(NSINSTALL) -D $(@D); else true; fi
 	rm -f $@
 	$(PREPROCESS_FORMS_CSS) > $@