Fix gnupg2 build without gettext

packages/gnupg2/agent-agent.h.patch

@@ -0,0 +1,12 @@
+diff -u -r ../gnupg-2.1.6/agent/agent.h ./agent/agent.h
+--- ../gnupg-2.1.6/agent/agent.h	2015-06-30 16:26:08.000000000 -0400
++++ ./agent/agent.h	2015-07-06 08:39:31.806515184 -0400
+@@ -310,7 +310,7 @@
+   agent_Lunderscore (ctrl_t ctrl, const char *string)           \
+   {                                                             \
+     return ctrl? i18n_localegettext (ctrl->lc_messages, string) \
+-      /*     */: gettext (string);                              \
++      /*     */: string;                              \
+   }
+ 
+