flac: Fix encoder and decode progress messages with --ogg.

Problem discussed here:

   http://lists.xiph.org/pipermail/flac-dev/2014-June/004808.html

The values for the interval between two updates (e->stats_mask,
e->stats_frames_interval) were set ~10 years ago, and it is small
for current CPUs. It was now been increased too (0x3f -> 0xff, etc).
The update interval is still less than 1 second.

Patch-from: lvqcl <lvqcl.mail@gmail.com>
2 files changed