fix build issue when --enable-core-odbc-support on fresh checkout

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@5771 d0543943-73ff-0310-b7d9-9358b9ac24b2

Makefile.am

@@ -134,7 +134,7 @@ endif
 
 if ADD_ODBC
 libfreeswitch_la_SOURCES += src/switch_odbc.c
-CORE_LIBS     += -lodbc
+libfreeswitch_la_LDFLAGS     += -lodbc
 endif