buildGraalvmNativeImage: fix UTF-8 encoding issue for JVM dependencies

Now that we can pass build arguments for the GraalVM builder again (see
https://github.com/NixOS/nixpkgs/pull/282901), this should work again.

Fix issue: https://github.com/NixOS/nixpkgs/issues/283953

pkgs/build-support/build-graalvm-native-image/default.nix

@@ -16,14 +16,13 @@
     "-H:Name=${executable}"
     "-march=compatibility"
     "--verbose"
-    "-J-Dsun.stdout.encoding=UTF-8"
-    "-J-Dsun.stderr.encoding=UTF-8"
   ]
   # Extra arguments to be passed to the native-image
 , extraNativeImageBuildArgs ? [ ]
   # XMX size of GraalVM during build
 , graalvmXmx ? "-J-Xmx6g"
 , meta ? { }
+, LC_ALL ? "en_US.UTF-8"
 , ...
 } @ args:
 
@@ -45,6 +44,8 @@ in
 stdenv.mkDerivation ({
   inherit dontUnpack jar;
 
+  env = { inherit LC_ALL; };
+
   nativeBuildInputs = (args.nativeBuildInputs or [ ]) ++ [ graalvmDrv glibcLocales removeReferencesTo ];
 
   nativeImageBuildArgs = nativeImageBuildArgs ++ extraNativeImageBuildArgs ++ [ graalvmXmx ];

pkgs/development/interpreters/babashka/default.nix

@@ -36,6 +36,7 @@ let
       $out/bin/bb '(+ 1 2)' | fgrep '3'
       $out/bin/bb '(vec (dedupe *input*))' <<< '[1 1 1 1 2]' | fgrep '[1 2]'
       $out/bin/bb '(prn "bépo àê")' | fgrep 'bépo àê'
+      $out/bin/bb '(:out (babashka.process/sh "echo" "ä"))' | fgrep 'ä'
     '';
 
     postInstall = ''