Updated live555 to 2020.11.29.

Backported upstream patch to fix compilation.

Fixed up LIVE555 CFLAGS to avoid passing twice.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Signed-off-by: Michel Promonet <michel.promonet@free.fr>

Removed upstreamed patches.

Updated live555.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

Switched to using versioned releases.

Removed md5 usage and went full sha256.

Added uclibc++ support by backporting upstream patches.

Various other adjustments.

Signed-off-by: Rosen Penev <rosenp@gmail.com>