Makefile: added 'make strip' target

Binaries are always built with symbol table in to easy
debugging and profiling.

It is now possible to run:

make strip

To remove symbol table from the compiled binary. This
could be useful to prepare the release version.

Patch by Heinz van Saanen.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

src/Makefile

@@ -75,6 +75,7 @@ help:
 	@echo "make osx-ppc64      >  PPC-Mac OS X 64 bit. Compiler = g++"
 	@echo "make osx-x86        >  x86-Mac OS X 32 bit. Compiler = g++"
 	@echo "make osx-x86_64     >  x86-Mac OS X 64 bit. Compiler = g++"
+	@echo "make strip          >  Strip executable"
 	@echo "make clean          >  Clean up"
 	@echo ""
 
@@ -157,6 +158,9 @@ osx-x86_64:
 	LDFLAGS+='-arch x86_64' \
 	all
 
+strip:
+	strip $(EXE)
+
 
 ### Compilation. Do not change
 $(EXE): $(OBJS)