Revert "Add armv7a-none-eabi target"

This reverts commit c5a119f.
aeronautical-informatics · wucke13 · Jun 15, 2021 · May 24, 2021 · Jun 30, 2021 · Jul 29, 2021
commit fcf8b4db406d15757e83f9cb72d7dccde6f39eae
diff --git a/flake.nix b/flake.nix
@@ -21,7 +21,6 @@
             stable.cargo
             stable.rustc
             stable.rustfmt
-            targets.armv7a-none-eabi.stable.rust-std
           ];
           naersk-lib = (naersk.lib."${system}".override {
             cargo = rust-toolchain;