Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

(cid #1251048 and #1251059)

Fixes searching for native qt5 progs on cygwin and msys2

The reason for the issue is that on windows if there is a space in the path
or if the program is prepends with .exe and we specify the search PATH
in AC_PATH_PROGS we must enclose them in quotes or the program will not be
found.

For future reference, if anyone uses AC_PATH_PROGS please enclose defined
search paths (if you have any) in quotes
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

This mostly reverts commit 6a6c23bf.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

They are superseded by makeCurrent() and releaseCurrent().

The documentation promises that the picture is unlocked before it is
displayed, so actually do that.

Cc: Antti Ajanki <antti.ajanki@iki.fi>

date is always >= VLC_TS_INVALID

Original channels is under-specified in my opinion. If you know where
the design documentation is, please tell me.

Do like the other outputs do.

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