FfmpegDecoderPlugin: add application/flv to mime types list

Conflicts:
	NEWS
configure.ac: detect system "ar"

Conflicts:
	NEWS
decoder/mikmod: use MikMod_free() to free the title on libmikmod-3.2

Player_LoadTitle() returns an aligned pointer in libmikmod-3.2 that
cannot be freed with free(). The correct way to do this now is
MikMod_free() which extracts the original pointer from the buffer and
frees that.

Signed-off-by: Christoph Mende <mende.christoph@gmail.com>
decoder, asap: fix use after free.