Merge branch 'fix-nix-shell' into 'master'

Add glibc_multi to build input, multiStdenv is not needed anymore

See merge request astro/rust-card10!4

shell.nix

@@ -3,10 +3,11 @@
 with pkgs;
 with import ./default.nix;
 
-multiStdenv.mkDerivation {
+stdenv.mkDerivation {
   name = "env";
   buildInputs = [
     gdb
+    glibc_multi
     rust
     pkgsCross.arm-embedded.stdenv.cc
     openocd