ctemplate 2.3
Remove deprecated --use-{gcc,llvm,clang}

Closes #29380.
Remove CLTDependency

Closes #29379.
hexchat: optional python3 support

Closes #29150.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Added executable grun script

The quick start guide on the antlr website (http://www.antlr.org/)
uses a TestRig class inside the antlr jar which the authors aliased as
grun. This alias will get installed as a wrapper script.
antlr: add 4.2.2 bottle.