Use av_compare_ts to compare against the -t end time instead of using

floating point.
Should fix different results between PPC and x86 for the idroq-video-encode
FATE test.

Originally committed as revision 21745 to svn://svn.ffmpeg.org/ffmpeg/trunk

ffmpeg.c

@@ -2319,7 +2319,7 @@ static int av_encode(AVFormatContext **output_files,
         }
 
         /* finish if recording time exhausted */
-        if (pkt.pts * av_q2d(ist->st->time_base) >= (recording_time / 1000000.0)) {
+        if (av_compare_ts(pkt.pts, ist->st->time_base, recording_time, (AVRational){1, 1000000}) >= 0) {
             ist->is_past_recording_time = 1;
             goto discard_packet;
         }