Remove a useless autoconf macro
Remove a useless autoconf macro

BelledonneCommunications/vo-amrwbenc,BelledonneCommunications/vo-amrwbenc,jiangjianping/vo-amrwbenc,mstorsjo/vo-amrwbenc,mstorsjo/vo-amrwbenc,jiangjianping/vo-amrwbenc