[libc++] Add a libc++ configuration that does not support localization

When porting libc++ to embedded systems, it can be useful to drop support
for localization, which these systems don't implement or care about.

Differential Revision: https://reviews.llvm.org/D90072

libcxx/test/std/strings/string.view/string.view.nonmem/quoted.pass.cpp

@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 // UNSUPPORTED: c++03, c++11
+// UNSUPPORTED: libcpp-has-no-localization
 
 // <iomanip>