Changed del and rmdir to rm -rf. clobber_all didn't work on win32.

java/build/Makefile.win

@@ -229,12 +229,12 @@ install::buildRunems
 
 
 clobber::
-	del /Q $(DIST)\..\*.xpi
-	rmdir /S/Q $(DIST)\..\javadev
-	rmdir /S/Q $(DIST)\..\java
+	rm -rf $(DIST)\..\*.xpi
+	rm -rf $(DIST)\..\javadev
+	rm -rf $(DIST)\..\java
 
 
 clobber_all::clobber
 
 
-clean::clobber
+clean::clobber