with structuredAttrs lists will be bash arrays which cannot be exported
which will be a issue with some patches and some wrappers like cc-wrapper
this makes it clearer that NIX_CFLAGS_COMPILE must be a string as lists
in env cause a eval failure
https://hydra.nixos.org/build/108321871https://hydra.nixos.org/build/108556036
Things done:
* SSE2 isn't available for the aarch64-target of GCC (the package builds
on aarch64 without those flags and works fine as well).
* Added missing darwin libraries.
* Applied a darwin-specific patch which disables i386 as target platform
(breaks at least on MacOS catalina otherwise).