modules/misc/gnutls.c:789: undefined reference to `gnutls_certificate_set_x509_crl_file'

It is not clear that static linking is superior in our case
Shared linking could even reduce package size (only one copy of libstdc++ shipped)

21:04 < jon_y> libtool prevents static linking if you are working with dlls, it is by
               design

This works around a conflict with <winioctl.h>.

It does not work on Windows, and is not thread-safe on Linux.

It is missing some features w.r.t. window management.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Tested with Built-in Input, Built-in Microphone and Griffin iMic USB system
Usage: qtsound://"Built-In Input" or qtsound://"iMic USB audio system"
Modified-by: Jean-Baptiste Kempf <jb@videolan.org>
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

A regression was there in 0.2.1

Closed #4373
(The samples still doesn't work if ffmpeg-mt is enabled, but that's probably a
ffmpeg/libav bug)

Needed on platform with poor tools support (== OSX)
TODO:
    find required versions for each tool and check if the system has them
    build GNU tar with xz support if xz was missing

Close #4206.