remove accidental addition

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13700 d0543943-73ff-0310-b7d9-9358b9ac24b2

src/mod/applications/mod_voicemail/Makefile

 BASE=../../../..
 include $(BASE)/build/modmake.rules
 LOCAL_CFLAGS += `if test -f $(BASE)/.libs/libfreeswitch_la-switch_odbc.o ; then echo -DSWITCH_HAVE_ODBC; fi ;`
-LOCAL_LIBADD += -liodbc