Increase connect time outs for SSL/TLS connections to 30 seconds.

On (very) slow machines this might improve the experience.
This only has effect on Second Life, since that's currently the only
grid that uses https for capabilities (all of them, except GetMesh,
GetMesh2 and GetTexture).

When linking the viewer with libmemleak, which significantly slows
down calls to malloc (and calloc, realloc, new, memalign and so on)
and free (delete), I no longer could download my inventory.
With this patch this was solved. The reason was that completing
the SSL/TLS handshake took more than 10 seconds (15 to 20).