Enable _LIBCPP_LOCALE__L_EXTENSIONS on CloudABI.
Enable _LIBCPP_LOCALE__L_EXTENSIONS on CloudABI.

CloudABI provides the _l() functions that are part of POSIX.1-2008, but
also the extensions that are available on systems like OS X and *BSD
(scanf_l, printf_l, etc).


git-svn-id: 756ef344af921d95d562d9e9f9389127a89a6314@231777 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx,llvm-mirror/libcxx