add clean-phpdbg rule to Makefile.frag to aid development

Author: krakjoe

Makefile.frag

@@ -9,3 +9,8 @@ install-phpdbg: $(BUILD_BINARY)
 	@$(mkinstalldirs) $(INSTALL_ROOT)$(localstatedir)/log
 	@$(mkinstalldirs) $(INSTALL_ROOT)$(localstatedir)/run
 	@$(INSTALL) -m 0755 $(BUILD_BINARY) $(INSTALL_ROOT)$(sbindir)/$(program_prefix)phpdbg$(program_suffix)$(EXEEXT)
+
+clean-phpdbg:
+	@echo "Cleaning phpdbg object files ..."
+	find sapi/phpdbg/ -name *.lo -o -name *.o | xargs rm -f
+