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/csignal b/libstdc++/include/csignal
index 2600a75..84f0e1d 100644
--- a/libstdc++/include/csignal
+++ b/libstdc++/include/csignal
@@ -36,6 +36,8 @@
#include <signal.h>
+extern "C++" {
+
namespace std
{
using ::sig_atomic_t;
@@ -43,4 +45,6 @@
using ::raise;
} // namespace std
+} // extern C++
+
#endif // BIONIC_LIBSTDCPP_INCLUDE_CSIGNAL__