Remove i686 from arch=()

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

PKGBUILD

@@ -4,7 +4,7 @@ pkgname=harvid
 pkgver=0.8.1
 pkgrel=2
 pkgdesc="HTTP Ardour Video Daemon"
-arch=('i686' 'x86_64')
+arch=('x86_64')
 url="http://x42.github.io/harvid/"
 license=('GPL')
 depends=('ffmpeg')