configure: set _FILE_OFFSET_BITS to detect fseeko
On Android fseeko() is not detected properly if if _FILE_OFFSET_BITS is not set.
It's always set in https://code.videolan.org/robUx4/x264/-/blob/master/common/osdep.h
On Android fseeko() is not detected properly if if _FILE_OFFSET_BITS is not set.
It's always set in https://code.videolan.org/robUx4/x264/-/blob/master/common/osdep.h
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