https://github.com/gnuradio/volk/releases/tag/v3.2.0

- Use SPDX license identifier.
- Switch to VCS sources.

Apply cmake package guidelines.
Remove quoted data.

archlinux/devtools!109 (comment 74475)

FTR, commands used to change arch=() and then verify the changes:

$ sed -Ei "/^arch=/{s/ *?['\"]?i686['\"]? *?//;s/ *$//}" */*/PKGBUILD*

$ grep -r i686 * | grep arch= | grep -v repos

$ svn diff | grep -A 1 ^-[^-] | grep -v -- -- | cut -c2- |
  while IFS=$'\n' read -r l1; IFS=$'\n' read -r l2; do
    echo "$l1 -> $l2"
  done | sort -u