audio/out: change license of some core files to LGPL

All contributors of the current code have agreed. ao.c requires a
"driver" entry for each audio output - we assume that if someone who
didn't agree to LGPL added a line, it's fine for ao.c to be LGPL
anyway. If the affected audio output is not disabled at compilation
time, the resulting binary will be GPL anyway, and ootherwise the
code is not included.

The audio output code itself was inspired or partially copied from
libao in 7a2eec4b59f4 (thus why MPlayer's audio code is named libao2).
Just to be sure we got permission from Aaron Holtzman, Jack Moffitt, and
Stan Seibert, who according to libao's SVN history and README are the
initial author. (Something similar was done for libvo, although the
commit relicensing it forgot to mention it.)

242aa6ebd40: anders mostly disagreed with the LGPL relicensing, but we
got permission for this particular commit.

0ef8e555735: nick could not be reached, but the include statement was
removed again anyway.

879e05a7c17: iive agreed to LGPL v3+ only, but this line of code was
removed anyway, so ao_null.c can be LGPL v2.1+.

9dd8f241ac2: patch author could not be reached, but the corresponding
code (old slave mode interface) was completely removed later.

0 files changed, 0 insertions, 0 deletions