fix for #5627. case sensitivity problem in Makefile.in

mailnews/ui/compose/resources/Makefile.in

@@ -30,7 +30,7 @@ SAMPLES_DIR = $(DIST)/bin/res/mailnews/compose
 
 EXPORT_RESOURCE_SAMPLES = \
 	$(srcdir)/msgcompose.xul \
-	$(srcdir)/msgcomposecommands.js \
+	$(srcdir)/MsgComposeCommands.js \
 	$(srcdir)/messengercompose.css \
 	$(srcdir)/msgcomposebody.html \
 	$(srcdir)/send.gif \