memory leak in _PyPathConfig_UpdateGlobal

[nascheme]

Bug report

Bug description:

This was found by running ./Programs/_testembed test_repeated_simple_init with valgrind. There should probably be a free operation when the interpreter is freed, in order to free the memory allocated inside _PyPathConfig_UpdateGlobal().

==1291165== 76 bytes in 1 blocks are possibly lost in loss record 3 of 6
==1291165==    at 0x48407B4: malloc (vg_replace_malloc.c:381)
==1291165==    by 0x2FED7B: _PyMem_RawMalloc (obmalloc.c:56)
==1291165==    by 0x302B31: _PyMem_DebugRawAlloc (obmalloc.c:2290)
==1291165==    by 0x302C02: _PyMem_DebugRawMalloc (obmalloc.c:2323)
==1291165==    by 0x3000EA: PyMem_RawMalloc (obmalloc.c:778)
==1291165==    by 0x300326: _PyMem_RawWcsdup (obmalloc.c:867)
==1291165==    by 0x488FBF: _PyPathConfig_UpdateGlobal (pathconfig.c:160)
==1291165==    by 0x4929D1: interpreter_update_config (pylifecycle.c:399)
==1291165==    by 0x494CBA: init_interp_main (pylifecycle.c:1147)
==1291165==    by 0x49563D: pyinit_main (pylifecycle.c:1309)
==1291165==    by 0x4957F4: Py_InitializeFromConfig (pylifecycle.c:1340)
==1291165==    by 0x49590A: Py_InitializeEx (pylifecycle.c:1371)
==1291165==    by 0x495988: Py_Initialize (pylifecycle.c:1381)
==1291165==    by 0x188B72: _testembed_Py_Initialize (_testembed.c:94)
==1291165==    by 0x188DDD: test_repeated_simple_init (_testembed.c:204)
==1291165==    by 0x18D01C: main (_testembed.c:2239)

CPython versions tested on:

CPython main branch

Operating systems tested on:

Linux

[nascheme]

Found while investigating gh-113055. This leak seems to be the last remaining one for the test if the global interned string cache is disabled.

[neonene]

IIUC, 3.11 behaves like that, where _PyPathConfig_UpdateGlobal() has the PyMem_RawFree functions. As to 3.11, I cannot see the measurable memory leak with the 5000 times of init/fini cycles followed by _PyPathConfig_UpdateGlobal().