bpo-35257: Avoid leaking LTO linker flags into distutils (GH-10900) (GH-11264)

When compiling 3rd party C extensions, the linker flags used by the
compiler for the interpreter and the stdlib modules, will get
leaked into distutils. In order to avoid that, the PY_CORE_LDFLAGS
and PY_LDFLAGS_NODIST are introduced to keep those flags separated.

(cherry picked from commit cf10a750f4)

Lib/test/pythoninfo.py

@@ -407,7 +407,10 @@ def collect_sysconfig(info_add):
         'OPT',
         'PY_CFLAGS',
         'PY_CFLAGS_NODIST',
+        'PY_CORE_LDFLAGS',
         'PY_LDFLAGS',
+        'PY_LDFLAGS_NODIST',
+        'PY_STDMODULE_CFLAGS',
         'Py_DEBUG',
         'Py_ENABLE_SHARED',
         'SHELL',