Remove i686 from arch=()

PKGBUILD

@@ -6,7 +6,7 @@ pkgver=3.26.2
 pkgrel=1
 pkgdesc="The next generation GNOME Shell"
 url="https://wiki.gnome.org/Projects/GnomeShell"
-arch=(i686 x86_64)
+arch=(x86_64)
 license=(GPL2)
 depends=(accountsservice caribou gcr gjs gnome-bluetooth gnome-menus upower
          gnome-session gnome-settings-daemon gnome-themes-standard gsettings-desktop-schemas