j: fix build on darwin

On darwin the compilation would fail with the following warning:
```
clang-7: error: argument unused during compilation: '-fno-strict-overflow' [-Werror,-Wunused-command-line-argument]
```
This error happens because the `-fno-strict-overflow` is passed to the compiler. To fix this, disable the `strictoverflow` hardening feature. Also see NixOS#39687.

ZHF: NixOS#97479

pkgs/development/interpreters/j/default.nix

@@ -27,6 +27,9 @@ stdenv.mkDerivation rec {
 
   doCheck = true;
 
+  # Causes build failure due to warning
+  hardeningDisable = stdenv.lib.optional stdenv.cc.isClang "strictoverflow";
+
   buildPhase = ''
     export SOURCE_DIR=$(pwd)
     export HOME=$TMPDIR