[SWIG] Deprecate SWIG 1.x
The last swig 1.x release dates from 2009, now 10 years ago. Recently, I
fixed an issue that prevented us from using swig 4 (r364974), which
turned out to be not backward compatible with swig 1.x (r365718).
This patch deprecates this (really old) version of swig and makes swig 2
the minimum supported version in LLDB . This should be fine for the
build bots, which are all running swig 3 or later.
Differential revision: https://reviews.llvm.org/D64782