fix rc files conflict in parallel build

* cygwin/GNUmakefile.in (%.rc): generate .rc files separately to
  get rid of conflict in parallel build.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53480 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

cygwin/GNUmakefile.in

@@ -54,11 +54,11 @@ $(RUBY_EXP) $(LIBRUBY_SO): $(DLL_BASE_NAME).res.@OBJEXT@
 	$(ECHO) compiling $@
 	$(Q) $(WINDRES) --include-dir . --include-dir $(<D) --include-dir $(srcdir)/win32 $< $@
 
-$(RCFILES): $(RBCONFIG) $(srcdir)/revision.h $(srcdir)/win32/resource.rb
+%.rc: $(RBCONFIG) $(srcdir)/revision.h $(srcdir)/win32/resource.rb
 	$(ECHO) generating $@
 	$(Q) $(MINIRUBY) $(srcdir)/win32/resource.rb \
 	  -ruby_name=$(RUBY_INSTALL_NAME) -rubyw_name=$(RUBYW_INSTALL_NAME) \
-	  -so_name=$(DLL_BASE_NAME) \
+	  -so_name=$(DLL_BASE_NAME) -output=$(*F) \
 	  . $(icondirs) $(srcdir)/win32
 
 $(PROGRAM): $(RUBY_INSTALL_NAME).res.@OBJEXT@

win32/resource.rb

@@ -52,6 +52,7 @@ end
   [$rubyw_name,  CONFIG["EXEEXT"], 'VFT_APP', 'GUI', rubyw_icon || ruby_icon],
   [$so_name,     '.dll',           'VFT_DLL', 'DLL', dll_icons.join],
 ].each do |base, ext, type, desc, icon|
+  next if $output and $output != base
   open(base + '.rc', "w") { |f|
     f.binmode if /mingw/ =~ RUBY_PLATFORM