a little bit more clean

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@15912 d0543943-73ff-0310-b7d9-9358b9ac24b2

Makefile.am

@@ -366,6 +366,8 @@ core-install: core_install
 
 clean_core: clean-libLTLIBRARIES
 	rm -f $(libfreeswitch_la_OBJECTS)
+	rm -f `echo $(libfreeswitch_la_OBJECTS) | sed -e's|.lo|.o|g'`
+
 install_core: install-libLTLIBRARIES
 
 core_install: install_core