Fix small errors in PKGBUILDs.

- aircrack-ng needed a switch from 'pkgname' to 'pkgbase'.
- cutycapt \
  edb-debugger \
  and smali needed some pkgdesc quotation mark fixes.
Allow both 'build-all' and 'do-build' to handle gpg-agent.
Add 'install-deps'.

This script installs all package dependencies.