m4a streaming via http fails if Content-Type is "audio/mpeg"

Apache/2.4.18 as configured on people.videolan.org returns "audio/mpeg" for .m4a files. libvlc HEAD (6bc7a637) assumes that this must be an mp3 file and chooses the demuxer accordingly, which leads to a playback failure.

In libvlc 2.2, mplayer, QuickTime Player, AVFoundation and iTunes, playback works just fine.

Sample URL:

http://people.videolan.org/~feepk/test/01_Path.m4a

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