This is the version in Debian Jessie (oldstable).

This is kind of a revert of commit
b2e3c075, which is not any longer
necessary since commit 0dd4b52b
removed the last call to `av_open_input_stream()`.

Remove another dependency on the config/Global library.

Fixes memory leaks.

afCloseFile() uses free(), so we need to use malloc().