pythongh-126789: Correct sysconfig test exclusions for iOS and Androi…

…d. (pythonGH-126941)

(cherry picked from commit 3938fd6)

Lib/test/test_sysconfig.py

@@ -591,7 +591,7 @@ def test_osx_ext_suffix(self):
         suffix = sysconfig.get_config_var('EXT_SUFFIX')
         self.assertTrue(suffix.endswith('-darwin.so'), suffix)
 
-    @unittest.skipIf(sys.platform == 'wasi', 'venv is unsupported on WASI')
+    @requires_subprocess()
     def test_config_vars_depend_on_site_initialization(self):
         script = textwrap.dedent("""
             import sysconfig
@@ -615,7 +615,7 @@ def test_config_vars_depend_on_site_initialization(self):
         self.assertEqual(no_site_config_vars['base'], site_config_vars['installed_base'])
         self.assertEqual(no_site_config_vars['platbase'], site_config_vars['installed_platbase'])
 
-    @unittest.skipIf(sys.platform == 'wasi', 'venv is unsupported on WASI')
+    @requires_subprocess()
     def test_config_vars_recalculation_after_site_initialization(self):
         script = textwrap.dedent("""
             import sysconfig
@@ -639,7 +639,7 @@ def test_config_vars_recalculation_after_site_initialization(self):
         #self.assertEqual(config_vars['after']['prefix'], venv.prefix)  # FIXME: prefix gets overwriten by _init_posix
         #self.assertEqual(config_vars['after']['exec_prefix'], venv.prefix)  # FIXME: exec_prefix gets overwriten by _init_posix
 
-    @unittest.skipIf(sys.platform == 'wasi', 'venv is unsupported on WASI')
+    @requires_subprocess()
     def test_paths_depend_on_site_initialization(self):
         script = textwrap.dedent("""
             import sysconfig