[tlbuild] aarch64-linux

[Johannes Hielscher]

Hi TL builders,

here on aarch64-linux, all 457 binaries from -r57305 trunk build fine,
including xz (new version 5.2.5 released in 2020-03-17), xindy,
asymptote 2.68, and all tests passing.

I noticed that, beginning with 2020-11-26, all compiles at the ConTeXt
build farm https://build.contextgarden.net/#/builders/67 have failed:
gd's ./configure complains about missing freetype (that had been built
immediately before).

The only upstream modification about that time was Karl's -r56964
“automake 1.16.3”, but that had already been included in the last
successful run on 2020-11-22 too.

Idk what suddenly went wrong there. But at least from my side,
everything looks great on aarch64-linux (Debian Buster 10.7) atm.

Best,
Johannes