pkg/archlinux: Import waffle-1.3.0 PKGBUILD from AUR

Signed-off-by: Chad Versace <chad.versace@linux.intel.com>
pkg/archlinux: Remove PKGBUILD.template

The build system generated a real PKGBUILD from PKGBUILD.template.
Rather than do that, let's just maintain *real* PKGBUILD's from the AUR
that are known to work.