Added FD_CLOEXEC flag to client/server socket file descriptors

runtime/bin/socket_android.cc

Index: runtime/bin/socket_android.cc
diff --git a/runtime/bin/socket_android.cc b/runtime/bin/socket_android.cc
index d4960f6e23964566bcab6e17157c1502914e9d6e..eac7d1239fac8c153ee7cc9fba6e169e8c9ba9f6 100644
--- a/runtime/bin/socket_android.cc
+++ b/runtime/bin/socket_android.cc
@@ -29,6 +29,7 @@ intptr_t Socket::CreateConnect(const char* host, const intptr_t port) {
     return -1;
   }
 
+  FDUtils::SetCloseOnExec(fd);
   FDUtils::SetNonBlocking(fd);
 
   server = gethostbyname(host);
@@ -188,6 +189,8 @@ intptr_t ServerSocket::CreateBindListen(const char* host,
     return -1;
   }
 
+  FDUtils::SetCloseOnExec(fd);
+
   int optval = 1;
   TEMP_FAILURE_RETRY(
       setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval)));