Revert changes to emscripten/__main__.py

Tools/wasm/emscripten/__main__.py

@@ -215,29 +215,12 @@ def configure_emscripten_python(context, working_dir):
     exec_script = working_dir / "python.sh"
     exec_script.write_text(
         dedent(
-            """\
+            f"""\
             #!/bin/sh
 
-            # Macs come with free BSD coreutils which doesn't have the -s option
-            # so feature detect and work around it.
-            if which grealpath > /dev/null; then
-                # It has brew installed gnu core utils, use that
-                REALPATH="grealpath -s"
-            elif which realpath > /dev/null && realpath --version | grep GNU > /dev/null; then
-                # realpath points to GNU realpath so use it.
-                REALPATH="realpath -s"
-            else
-                # Shim for macs without GNU coreutils
-                abs_path () {
-                    echo "$(cd "$(dirname "$1")" || exit; pwd)/$(basename "$1")"
-                }
-                REALPATH=abs_path
-            fi
-            """
-            f"""
             # We compute our own path, not following symlinks and pass it in so that
             # node_entry.mjs can set sys.executable correctly.
-            exec {host_runner} {node_entry} "$($REALPATH "$0")" "$@"
+            exec {host_runner} {node_entry} "$(realpath -s $0)" "$@"
             """
         )
     )