x11-toolkits/vte3: update to 0.64.1, latest upstream

This is a minor update. While doing the update, I tried to pull
in fixes from PR 240548 -- those were submitted upstream years ago,
landed upstream, then removed again upstream in favor of fdwalk(),
which might end up in in FreeBSD eventually. The fdwalk() call
applies FD_CLOEXEC to all the file descriptors -- the original
patch from the PR called closefrom(), but doing **that** makes
consumers of vte3 (e.g. roxterm) hang / close. So just updating,
not dealing with the issue of the fallback fdwalk() implementation
being clunky.

PR:		240548