Win32: Remove win32 directory if empty

Author: nobu

cygwin/GNUmakefile.in

@@ -99,6 +99,8 @@ yes-test-all:	 export MSYS2_ARG_CONV_EXCL=$(MSYS2_ARG_CONV_EXCL_PARAM)
 yes-test-almost: export MSYS2_ARG_CONV_EXCL=$(MSYS2_ARG_CONV_EXCL_PARAM)
 test/% spec/%/ spec/%_spec.rb: export MSYS2_ARG_CONV_EXCL=$(MSYS2_ARG_CONV_EXCL_PARAM)
 
+distclean-local::
+	$(RMDIR) win32
 endif
 
 $(LIBRUBY_SO): $(RUBYDEF)

win32/Makefile.sub

@@ -1279,6 +1279,7 @@ distclean-local::
 		$(Q)$(RM) ext\config.cache $(RBCONFIG:/=\) $(CONFIG_H:/=\)
 		-$(Q)$(RM) $(INSTALLED_LIST:/=\) $(arch_hdrdir:/=\)\ruby\config.h verconf.h
 		-$(Q)$(RMDIRS) $(arch_hdrdir:/=\)\ruby
+		-$(Q)$(RMDIR) win32
 
 ext/clean.mk ext/distclean.mk ext/realclean.mk::
 	$(Q)if exist $(EXTS_MK) $(MAKE) -k -f $(EXTS_MK) top_srcdir=$(srcdir) $(*F)