Without the change the build in `master` fails as
https://hydra.nixos.org/build/247555199:
gimx.c:195:6: error: implicit declaration of function 'getenv' [-Werror=implicit-function-declaration]
195 | if(getenv("GIMXCONF")) { snprintf(file_path, sizeof(file_path), "%s", gimx_params.config_file); }
| ^~~~~~
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
*Flags implies a list
slightly relevant:
> stdenv: start deprecating non-list configureFlags https://github.com/NixOS/nixpkgs/pull/173172
the makeInstalledTests function in `nixos/tests/installed-tests/default.nix` isn't available outside of nixpkgs so
it's not a breaking change
