[3.15] gh-156703: Set LD_LIBRARY_PATH in SystemTap trace commands (GH-156424) (GH-156755)

Prefix commands passed to stap -c with LD_LIBRARY_PATH via env, when
probes reside in libpython. This allows the interpreter to find
libpython when staprun does not preserve the loader path.
(cherry picked from commit faf4e52)

Co-authored-by: stratakis <cstratak@redhat.com>

Author: miss-islington

Lib/test/test_dtrace.py

@@ -243,6 +243,17 @@ def render_script(self, filename):
 
         return script.replace(self.PROBE_PLACEHOLDER, self.python_probe())
 
+    def generate_trace_command(self, script_file, subcommand=None):
+        probe_binary = get_probe_binary()
+        if subcommand and probe_binary != sys.executable:
+            library_path = os.path.dirname(probe_binary)
+            if existing_path := os.environ.get("LD_LIBRARY_PATH"):
+                library_path = os.pathsep.join((library_path, existing_path))
+            env = shlex.join(["env", f"LD_LIBRARY_PATH={library_path}"])
+            subcommand = f"{env} {subcommand}"
+
+        return super().generate_trace_command(script_file, subcommand)
+
     def trace(self, script_file, subcommand=None, *, timeout=None,
               check_returncode=False):
         with tempfile.NamedTemporaryFile(