mosh: Fix compilation with libcxx

Partial backport of upstream patch.``

Signed-off-by: Rosen Penev <rosenp@gmail.com>

net/mosh/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=mosh
 PKG_VERSION:=1.3.2
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://mosh.org/

net/mosh/patches/020-std.patch

@@ -0,0 +1,10 @@
+--- a/src/network/network.cc
++++ b/src/network/network.cc
+@@ -60,7 +60,6 @@
+ #define AI_NUMERICSERV 0
+ #endif
+ 
+-using namespace std;
+ using namespace Network;
+ using namespace Crypto;
+