betaflight: don’t use nano

not in newlib

pkgs/development/misc/stm32/betaflight/default.nix

@@ -32,6 +32,9 @@ in stdenv.mkDerivation rec {
   postPatch = ''
     sed -ri "s/REVISION.*=.*git log.*/REVISION = ${builtins.substring 0 10 src.rev}/" Makefile # Simulate abbrev'd rev.
     sed -ri "s/binary hex/hex/" Makefile # No need for anything besides .hex
+
+    substitutateInPlace Makefile \
+      --replace "--specs=nano.specs" ""
   '';
 
   enableParallelBuilding = true;