This will break for the people with a linux/videodev2.h in srcdir or srcdir/modules/access but that's quite unlikely.
Closes #1238

- Fix a bunch of abuse of strncmp (memcmp rulez)

(This introduces a lot of warnings)

Somehow gettext fails on mingw32 here, so cannot test

src/Makefile.am: Only allow libvlc-control symbols that are prefixed by libvlc|mediacontrol. (Use to be symbol that contains libvlc or mediacontrol. This is a fix for Mac OS X and libtool.

automake could hardly keep up with 700 targets.

Don't scale when source or destination width/height is zero. Fixes a arithmic exception (division by zero).