Merge pull request #36745 from 3405691582/ModuleDirArchitectureNameOpenBSD

[test] Use target_arch for module dir on OpenBSD.

Author: slavapestov

test/lit.cfg

@@ -1954,6 +1954,8 @@ if swift_execution_tests_extra_flags:
 relative_platform_module_dir_prefix = ''
 if platform.system() != 'Darwin':
     relative_platform_module_dir_prefix = os.path.join(config.target_sdk_name, run_cpu)
+    if platform.system() == 'OpenBSD':
+      relative_platform_module_dir_prefix = os.path.join(config.target_sdk_name, target_arch)
 platform_module_dir = make_path(test_resource_dir, config.target_sdk_name)
 
 platform_dylib_dir = platform_module_dir