user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

user/include/mlibc/tests/rtld/env.py

@@ -0,0 +1,27 @@
+import os
+import sys
+
+def main():
+    args = sys.argv[1:]
+    env = os.environ.copy()
+
+    # parse environment variable assignments
+    i = 0
+    while i < len(args) and '=' in args[i]:
+        var, val = args[i].split('=', 1)
+        env[var] = val
+        i += 1
+
+    if i < len(args):
+        exe_wrapper = os.environ.get('MESON_EXE_WRAPPER')
+        if exe_wrapper:
+            cmd = [exe_wrapper] + args[i:]
+        else:
+            cmd = args[i:]
+        os.execvpe(cmd[0], cmd, env)
+    else:
+        print("No command provided to execute.", file=sys.stderr)
+        sys.exit(1)
+
+if __name__ == "__main__":
+    main()