If the sample per packet is wrong, denote to qt_version 0

Ref: http://forum.videolan.org/viewtopic.php?f=14&t=103013

This accounts for sporadic assert failed at vlc termination.

This will be used later.

Hardware floating point must be enabled explicitly.

This also removes the NEON_CFLAGS substition variable and the check for
ARMv6, neither of which are anymore not used.

minizip should not and cannot be compiled without zlib.

extras/package: iOS: enable thumb for compilation, clean up the AS definitions and disable freetype for now

Should be tested on Android/Linux.

Thanks to Mans Rullgard for the help.

if a logo is bigger than a video and if positioning results in negative
offsets, vlc crashes in the blend function.

This patch adds a warning, and offset is forced to 0 if negative.

Note that a bigger logo is not a problem per se. (Blend truncates the logo).
Only offsetting it with negative values was a problem.

Also update avcodec encoder and switcher x86 checks.

Pointed-out-by: Michał Trzebiatowski <hippie_1968@hotmail.com>

Signed-off-by: Christoph Miebach <christoph.miebach@web.de>

This matches a similar problem on x264: http://mailman.videolan.org/pipermail/x264-devel/2012-January/009073.html

With minor updates by me.
Signed-off-by: Felix Paul Kühne <fkuehne@videolan.org>

Show drift value in debug log

The frame rate is retrieved from the capture parameters nowadays. This
option has no effects at the moment.

It might be nice to reintroduce it so that it can select one rate when
a device supports more than one. But that was never implemented so far.

Close #7240