envconfig: add more binutils variables
envconfig: add more binutils variables

follow standard variables and allow distributions to remove some entries from their cross-files

ex:
https://github.com/void-linux/void-packages/blob/f23acdd24bfade3a4e14809fafaffe09b3c3c318/common/build-style/meson.sh#L50-L54

variables chosen from the variables nixos sets
https://github.com/NixOS/nixpkgs/blob/ea0f14a502c60223c96066de3ed548cb3be8ca47/pkgs/build-support/bintools-wrapper/setup-hook.sh#L58

sorted alphabetically

mesonbuild/meson,mesonbuild/meson,pexip/meson,pexip/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,pexip/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson,pexip/meson,mesonbuild/meson,mesonbuild/meson,pexip/meson,pexip/meson,mesonbuild/meson,pexip/meson