Fix for make clean on certain systems.

Fix "make clean" on strict POSIX systems that do not have the rm -v
switch.

Redo of #291 which was submitted against master, rather than
development.

engine/compilers/Make/Makefile

@@ -9,9 +9,9 @@ APP_TARGETS_DEBUG :=
 all: debug release
 
 clean:
-	rm -rfv Debug
-	rm -rfv Release
-	rm -rfv lib
+	rm -rf Debug
+	rm -rf Release
+	rm -rf lib
 
 .PHONY: all debug release clean