libs: use jglobus-1.8-dcache.3

jglobus-1.8 with custom fix for jumbo proxies

https://github.com/dCache/jglobus-1.8/commit/7388dbb36

Ticket: #7804
Acked-by: Paul Millar
Target: 2.2
Require-book: no
Require-notes: no
Patch: http://rb.dcache.org/r/5570/