fix(pacman): enclose directory paths in PKGBUILD in double quotes

[kevinaboos]

This ensures that paths with spaces on the target machine are properly preserved during pacman's installation of the package.

Context: some users of our Moxin app that was packaged for Arch Linux using cargo-packager reported that their pacman install command was failing due to paths containing whitespace.
Thanks to @cassaundra for proposing this fix and confirming that it works.

[amr-crabnebula]

Thank you, could you add a change file in .changes directory?

something like this:

---
"cargo-packager": patch
"@crabnebula/packager": patch
---

Fix `pacman` package failing to install when source directory contained whitespace.

[lucasfernog-crabnebula]

I tried pushing the change file myself but I couldn't 😢 lacking permissions on your repo

[kevinaboos]

oh shoot, sorry guys I completely forgot about this PR in the hecticness of so much travel. Will push shortly!

[kevinaboos]

done! thanks for the reminder, and my apologies for the delay.

[denjell-crabnebula]

Normally we require that commits are signed, but in the interest of approving your contribution I will relax the requirements this time.

[kevinaboos]

Normally we require that commits are signed, but in the interest of approving your contribution I will relax the requirements this time.

thanks, will keep that in mind for my next contribution.