[3.13] gh-127865: Fix build failure for systems without thread local support (GH-127866) (GH-127882)

This PR fixes the build issue introduced by the commit 628f6eb from
GH-112207 on systems without thread local support.
(cherry picked from commit f823910)

Co-authored-by: velemas <[email protected]>

Author: miss-islington

Misc/NEWS.d/next/Build/2024-12-12-17-21-45.gh-issue-127865.30GDzs.rst

@@ -0,0 +1 @@
+Fix build failure on systems without thread-locals support.

Python/import.c

@@ -747,7 +747,7 @@ const char *
 _PyImport_ResolveNameWithPackageContext(const char *name)
 {
 #ifndef HAVE_THREAD_LOCAL
-    PyThread_acquire_lock(EXTENSIONS.mutex, WAIT_LOCK);
+    PyMutex_Lock(&EXTENSIONS.mutex);
 #endif
     if (PKGCONTEXT != NULL) {
         const char *p = strrchr(PKGCONTEXT, '.');
@@ -757,7 +757,7 @@ _PyImport_ResolveNameWithPackageContext(const char *name)
         }
     }
 #ifndef HAVE_THREAD_LOCAL
-    PyThread_release_lock(EXTENSIONS.mutex);
+    PyMutex_Unlock(&EXTENSIONS.mutex);
 #endif
     return name;
 }
@@ -766,12 +766,12 @@ const char *
 _PyImport_SwapPackageContext(const char *newcontext)
 {
 #ifndef HAVE_THREAD_LOCAL
-    PyThread_acquire_lock(EXTENSIONS.mutex, WAIT_LOCK);
+    PyMutex_Lock(&EXTENSIONS.mutex);
 #endif
     const char *oldcontext = PKGCONTEXT;
     PKGCONTEXT = newcontext;
 #ifndef HAVE_THREAD_LOCAL
-    PyThread_release_lock(EXTENSIONS.mutex);
+    PyMutex_Unlock(&EXTENSIONS.mutex);
 #endif
     return oldcontext;
 }