JARDistribution force exclude dotfiles (.foo)

[eregon]

mx/src/mx/_impl/mx_jardistribution.py

Lines 716 to 718 in 5a7e670

	if os.path.basename(arcname).startswith('.'):
	mx.logv('Excluding dotfile: ' + origin)
	return None

This is problematic notably when using a JAR distribution to package Truffle internal resources, which may contain dotfiles for various reasons, due to e.g. including files from 3rd-party packages.

cc @tzezula @chumer

[eregon]

I can easily work around in this case.

[dougxc]

This is easy enough to fix but should use mx_compat to preserve the old behavior for suites that are currently depending on it (if any).

[chumer]

Good point. It might pull in new files. We should carefully check which files we are pulling in with this change.
So yes I think mx_compat would be a good start to be on the safe side.

[eregon]

Good point. It might pull in new files.

That's not a concern for Truffle languages resource jars because if currently they contain dot files the index will contain them but the jar won't and it will result in an error when extracting: https://graalvm.slack.com/archives/CNQSB2DHD/p1765305422419169?thread_ts=1765305407.559639&cid=CNQSB2DHD