Ripper source on mswin

* Get rid of command substitution for cmd.exe.
* Separate RM1 command to remove single file sans directory.

common.mk

@@ -1189,10 +1189,10 @@ $(REVISION_H): revision.tmp
 
 $(srcdir)/ext/ripper/ripper.c: $(srcdir)/ext/ripper/tools/preproc.rb $(srcdir)/parse.y id.h $(srcdir)/ext/ripper/depend
 	$(ECHO) generating $@
-	$(Q) VPATH=$${PWD-`pwd`} && $(CHDIR) $(@D) && \
+	$(Q) $(CHDIR) $(@D) && \
 	sed -e 's/{\$$([^(){}]*)[^{}]*}//g' -e /AUTOGENERATED/q depend | \
 	$(exec) $(MAKE) -f - $(mflags) \
-		Q=$(Q) ECHO=$(ECHO) RM="$(RM)" BISON=$(YACC) top_srcdir=../.. srcdir=. VPATH="$${VPATH}" \
+		Q=$(Q) ECHO=$(ECHO) RM="$(RM1)" BISON=$(YACC) top_srcdir=../.. srcdir=. VPATH=../.. \
 		RUBY="$(BASERUBY)" PATH_SEPARATOR="$(PATH_SEPARATOR)" LANG=C
 
 $(srcdir)/ext/json/parser/parser.c: $(srcdir)/ext/json/parser/parser.rl $(srcdir)/ext/json/parser/prereq.mk

template/Makefile.in

@@ -208,6 +208,7 @@ MAKEDIRS      = @MKDIR_P@
 CP            = cp
 MV            = mv
 RM            = rm -f
+RM1           = $(RM)
 RMDIR         = @RMDIR@
 RMDIRS        = @RMDIRS@
 RMALL         = @RMALL@

win32/Makefile.sub

@@ -89,6 +89,7 @@ RMALL = $(COMSPEC) /C $(srcdir:/=\)\win32\rm.bat -f -r
 MAKEDIRS = $(COMSPEC) /E:ON /C $(srcdir:/=\)\win32\makedirs.bat
 CP = copy > nul
 MV = move > nul
+RM1 = del /f /q
 !if !defined(BASERUBY)
 BASERUBY = ruby
 !endif