Fix typo.

llvm-svn: 214768
diff --git a/libcxx/test/lit.cfg b/libcxx/test/lit.cfg
index 51c1ff5..6c06373 100644
--- a/libcxx/test/lit.cfg
+++ b/libcxx/test/lit.cfg
@@ -209,7 +209,7 @@
         locale.setlocale(locale.LC_ALL, loc)
         config.available_features.add('locale.{}'.format(feature))
     except:
-        lit_config.warning('The locale {} is not supported by your platoform. '
+        lit_config.warning('The locale {} is not supported by your platform. '
                            'Some tests will be unsupported.'.format(loc))
 
 # Gather various compiler parameters.