[MOVED FROM BAD 08/28] ext/x264/: Use video format library and GST_WRITE_*_BE macros...

[MOVED FROM BAD 08/28] ext/x264/: Use video format library and GST_WRITE_*_BE macros where applicable.

Original commit message from CVS:
* ext/x264/Makefile.am:
* ext/x264/gstx264enc.c: (gst_x264_enc_header_buf),
(gst_x264_enc_sink_set_caps), (gst_x264_enc_base_init),
(gst_x264_enc_class_init), (gst_x264_enc_log_callback),
(gst_x264_enc_init), (gst_x264_enc_init_encoder),
(gst_x264_enc_finalize), (gst_x264_enc_chain),
(gst_x264_enc_encode_frame), (plugin_init):
* ext/x264/gstx264enc.h:
Use video format library and GST_WRITE_*_BE macros where applicable.
Use finalize in stead of dispose.
Set up debug category and log callback.