www/yt-dlp: MFC update to 2026.08.19
probably catches up with website changes, and gets rid of the annoying
"WARNING: Your yt-dlp version (2026.03.17) is older than 90 days!" at startup
Provide assembly implementations of SHA-1 for amd64 in libc
Provide a generic assembly implementation for SHA-1 - this is considerably
faster than the C version.
Provide a SHA-NI assembly implementation that can be used on hardware that
has the SHA-NI instructions. This is considerably faster than the generic
assembly implementation.
Largely borrowed from libcrypto.
With input from naddy@
ok naddy@ tb@