CI: travis-ci: extend the build time for SSL to 60 minutes

As discussed in the thread below we're still facing build timeouts
on Travis on aarch64 and the truncated logs doesn't help. It's not
PCRE2 so let's try to extend the permitted time to build the SSL
lib.

   https://www.mail-archive.com/haproxy@formilux.org/msg37251.html
1 file changed