Various arm, musl and other patches

[angerman]

No description provided.

[tuxmaniac]

Oh man, this PR fixed runtime error for haskell-language-server built with musl as static PIE binary. I'm experimenting now with musl static PIE builds and almost broke my head with it :) If you interested, you can check fork and HLS build example and tell your opinion to it.

Btw, can you add static libsodium to musl overlay (for static musl nix-tools build)

   # and a few more packages that need their static libs explicitly enabled
   gmp = prev.gmp.override { withStatic = true; };
   ncurses = prev.ncurses.override { enableStatic = true; };
+  libsodium = prev.libsodium.overrideAttrs (_: { dontDisableStatic = true; });

[rvl]

@tuxmaniac - Also check out https://github.com/hercules-ci/haskell-language-server.nix/

[angerman]

bors try

[iohk-bors]

try

Timed out

[angerman]

Will roll this into our custom ghc branch eventially.