Getting rid of the GUI pop-ups

[Tory S. Anderson]

With Emacs 25.1.1, password prompts are no longer in the menu bar 
but via my (KDE/Plasma) window manager. Not only is this annoying, 
it is costly -- it takes 30 seconds to a full minute for the popup 
to appear, meanwhile Emacs is frozen. I would love for this to 
just be the menu prompt, as it used to be. I've tried

`(setq menu-prompting nil)` 

but it doesn't seem to have any effect. I see these prompts most 
often when opening .gpg files and when trying to perform a git 
push. I'm hoping someone will tell me there is a better way to 
disable these than just rebuilding emacs from source with X menus 
disabled (particularly as I have been pleased to get my emacs from 
the repo without needing to build from source).

Good news would be much appreciated!

- Tory