Don't block signals while performing system calls, but instead restart the

calls if they are interrupted.


[SVN r58628]

libs/asio

@@ -1 +1 @@
-Subproject commit 45acb2f7568328ac59b73569f0970cad56d119da
+Subproject commit cf8c031f87823a6de1ae81d5fe320a5f9e61285b