Rename system_lib -> system_cxx_lib. NFC

llvm-svn: 226061
diff --git a/libcxx/test/std/strings/string.conversions/stol.pass.cpp b/libcxx/test/std/strings/string.conversions/stol.pass.cpp
index d1cd75d..dbbccc9 100644
--- a/libcxx/test/std/strings/string.conversions/stol.pass.cpp
+++ b/libcxx/test/std/strings/string.conversions/stol.pass.cpp
@@ -7,8 +7,8 @@
 //
 //===----------------------------------------------------------------------===//
 //
-// XFAIL: with_system_lib=x86_64-apple-darwin11
-// XFAIL: with_system_lib=x86_64-apple-darwin12
+// XFAIL: with_system_cxx_lib=x86_64-apple-darwin11
+// XFAIL: with_system_cxx_lib=x86_64-apple-darwin12
 
 // <string>