Fix keychain timeout issue if timeout specified in keychain is greater than default max cache ttl in gnupg (default 2 hours)

gistfile1.txt

--- a/keychain	2010-05-07 19:24:17.000000000 +0200
+++ b/keychain	2014-09-18 16:14:29.000000000 +0200
@@ -735,7 +735,7 @@
             start_out=`ssh-agent`
         elif [ "$start_prog" = gpg ]; then
             if [ -n "${timeout}" ]; then
-                start_gpg_timeout="--default-cache-ttl `expr $timeout \* 60`"
+                start_gpg_timeout="--default-cache-ttl `expr $timeout \* 60` --max-cache-ttl `expr $timeout \* 60`"
             else
                 unset start_gpg_timeout
             fi