libmpg123: Re-introduce _64 symbols on native 64 bit offset platforms. This was a regression since 1.31 series. Sorry, too much cleanup, not enough testing. build: Better O_LARGEFILE logic, avoiding redefintion. ports/cmake: Require C99 (bug 360, among other points, thanks to Ozkan Sezer). Fix broken O_LARGEFILE logic (bug 360). Typo fix and cleanup, also manual SSE switch for Android on old x86 (