libstdc++: use extern "C++" in all our C++ system headers.
This is needed to build an independent toolchain with g++ that doesn't think
that all these headers are in C.
Change-Id: Ie9a8ccfcab7780d6a4e5722777d61c2b1b312001
diff --git a/libstdc++/include/cstring b/libstdc++/include/cstring
index 80473cc..d3d9387 100644
--- a/libstdc++/include/cstring
+++ b/libstdc++/include/cstring
@@ -37,6 +37,8 @@
#include <cstddef>
#include <string.h>
+extern "C++" {
+
namespace std
{
using ::memchr;
@@ -63,4 +65,6 @@
using ::strxfrm;
} // namespace std
+} // extern C++
+
#endif // BIONIC_LIBSTDCPP_INCLUDE_CSTRING__