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

@@ -5,7 +5,7 @@ pkgname=perl-string-crc32
 pkgver=1.5
 pkgrel=7
 pkgdesc="Perl/CPAN Module String::CRC32 : ZMODEMlike CRC32 generation"
-arch=("i686" "x86_64")
+arch=("x86_64")
 url="http://search.cpan.org/dist/String-CRC32"
 license=("GPL" "PerlArtistic")
 options=('!emptydirs')