macosx: re-write the resize control used in the black window style to use the MouseDown event instead of the MouseDragged event which is ignored on Leopard (should fix #5822)

macosx: make sure the fspanel is visible when using 'float-on-top' in combination with Lion's native fullscreen mode

console and socket mode are now exclusive on windows.

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

When the code for detecting the number of CPUs present was moved
the headers necessary to compile the AltiVec detection code on
OpenBSD/powerpc was mistakenly removed so this puts the headers
back as appropriate.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

It seems to also be used for chroma upsampling.
It fixes #5751.

There are no reasons to only apply them to the first one. Certainly
some options might only make sense with a single item. But then it
really boils down to having only one item. Some options *do* make
sense for all (>1) items.

i_prog takes its value from i_num_pmt which can't be negative, nor > 64

cosmetics, reindent