don't build curl client, we don't need it

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@4753 d0543943-73ff-0310-b7d9-9358b9ac24b2

libs/xmlrpc-c/configure.gnu

 #! /bin/sh
-./configure "$@" --disable-cplusplus --disable-wininet-client --disable-libwww-client --disable-shared --with-pic
+./configure "$@" --disable-cplusplus --disable-wininet-client --disable-libwww-client --disable-shared --with-pic --disable-curl-client