lang/gcc-ecj45: Deprecate port

Long time unsupported upstream. Latest version of gcc-ecj is 4.9
(instead of 4.5, tracked by this port) and is from 2013 according to
https://mirrors.kernel.org/sourceware/java/ .

Set expiration date within two weeks: the port has no more reverse
dependencies according to FreshPorts and is very old, there should be no
need to wait much longer before removing it.

PR: 269711
Discussed with: gerald (maintainer)