bpo-41700: Skip test if the locale is not supported (pythonGH-22081)

(cherry picked from commit 54a66ad)

Co-authored-by: Dong-hee Na <donghee.na92@gmail.com>

Author: corona10

Lib/test/test_c_locale_coercion.py

@@ -403,7 +403,10 @@ def test_PYTHONCOERCECLOCALE_set_to_one(self):
         # skip the test if the LC_CTYPE locale is C or coerced
         old_loc = locale.setlocale(locale.LC_CTYPE, None)
         self.addCleanup(locale.setlocale, locale.LC_CTYPE, old_loc)
-        loc = locale.setlocale(locale.LC_CTYPE, "")
+        try:
+            loc = locale.setlocale(locale.LC_CTYPE, "")
+        except locale.Error as e:
+            self.skipTest(str(e))
         if loc == "C":
             self.skipTest("test requires LC_CTYPE locale different than C")
         if loc in TARGET_LOCALES :