bug#7220: [build] target really-oldXMenu doesn't work

[Regis]

$ pwd
/home/bahamut/emacs/emacs.git/src
bahamut@Harmony-L3NEK37:~/emacs/emacs.git/src [master]
$ make really-oldXMenu
cd ; make  \
    CC='gcc' CFLAGS='-g -O2' MAKE='make'
make[1]: Entering directory `/home/bahamut'
make[1]: *** No targets specified and no makefile found.  Stop.
make[1]: Leaving directory `/home/bahamut'
make: *** [really-oldXMenu] Error 2

After investigation, I found that variable name $(oldxmenudir) in
src/Makefile.in should be $(oldXMenudir), following patch works well for
me:

Index: src/Makefile.in
=====================================================================
--- src/Makefile.in
+++ src/Makefile.in
@@ -660,7 +660,7 @@ really-lwlib:
 .PHONY: really-lwlib

 really-oldXMenu:
-       cd $(oldxmenudir); $(MAKE) $(MFLAGS) \
+       cd $(oldXMenudir); $(MAKE) $(MFLAGS) \
     CC='$(CC)' CFLAGS='$(CFLAGS)' MAKE='$(MAKE)'
        @true  # make -t should not create really-oldXMenu.
 .PHONY: really-oldXMenu


--
Best Regards,
Regis.