fix build for sh sheel

src/Makefile

@@ -599,7 +599,7 @@ ifndef NOUPX
 	-$(UPX) $(UPX_OPTS) $(BIN)/$(EXENAME)
 endif
 endif
-	@echo Build is done, please look for $(EXENAME) in $(BIN), (checking for post steps)
+	@echo Build is done, please look for $(EXENAME) in $(BIN), \(checking for post steps\)
 
 reobjdump:
 	@echo Redumping debugging info