Fix FILE struct compatibility with Android API level >= 21 * lib/stdio-impl.h: Test explicitly for __ANDROID__ instead of __sferror. Recent versions of Bionic's stdio.h no longer define __sferror. * lib/fbufmode.c: Likewise. * lib/fflush.c: Likewise. * lib/fpurge.c: Likewise. * lib/freadable.c: Likewise. * lib/freadahead.c: Likewise. * lib/freading.c: Likewise. * lib/freadptr.c: Likewise. * lib/freadseek.c: Likewise. * lib/fseeko.c: Likewise. * lib/fseterr.c: Likewise. * lib/fwritable.c: Likewise. * lib/fwriting.c: Likewise.