[PATCH 1/1] avutil: remove implicit inclusion of error.h through avutil.h

added the include to all .c files which matched AVERROR|av_strerror,
headers usually mention AVERROR only in comments. One could argue
whether the return value makes already use of libavutil/error.h and I
guess our downstreams would be less annoyed if headers which declare
functions with AVERROR* return values would include error.h. At least
if they use av_strerror() or AVERROR values.

Janne
---8<---

---
 avconv.c                          |    1 +
 avconv_filter.c                   |    1 +
 avconv_opt.c                      |    1 +
 avplay.c                          |    1 +
 avprobe.c                         |    1 +
 avserver.c                        |    1 +
 cmdutils.c                        |    1 +
 libavcodec/4xm.c                  |    1 +
 libavcodec/8svx.c                 |    1 +
 libavcodec/a64multienc.c          |    1 +
 libavcodec/aacdec.c               |    1 +
 libavcodec/aacenc.c               |    1 +
 libavcodec/aacsbr.c               |    1 +
 libavcodec/ac3enc.c               |    1 +
 libavcodec/ac3enc_float.c         |    1 +
 libavcodec/ac3enc_template.c      |    1 +
 libavcodec/adpcm.c                |    1 +
 libavcodec/adpcmenc.c             |    1 +
 libavcodec/adx.c                  |    1 +