gh-53950: Clear MESSAGES in msgfmt

[StanFromIreland]

cc @tomasr8 @merwok

• Issue: msgfmt.py generates invalid mo because msgfmt.make() does not clear dictionary #53950

[tomasr8]

What would be even better is not having a global variable at all, though that would be a larger change and is already partially covered by #10875 I believe.

[StanFromIreland]

We can just clear it for now, till the larger change is merged.

[StanFromIreland]

Also request @serhiy-storchaka

[merwok]

I am unsure about the better fix here. Why not eliminate the global variable if that fixes the problem? Then it will make the other PR smaller.

[StanFromIreland]

@merwok I updated the PR with that if that is what you prefer, it is not too bad, the diff is pretty low.

[serhiy-storchaka]

Sharing MESSAGES between files is a (mis-)feature. See #10875 which solves this problem more thoroughly.

[StanFromIreland]

Do you mind splitting it from the larger pr, it would simplify it as Eric mentioned.