Remove obsolete PKGBUILD file

It's ancient

packaging/arch/PKGBUILD

-pkgname=ksirk
-pkgver=1.8beta1
-pkgrel=1
-pkgdesc="KsirK is a strategy game for KDE inspired by the well known game Risk."
-url='http://www.kde-apps.org/content/show.php?content=21450'
-license="GPL"
-depends=('kdebase')
-makedepends=()
-conflicts=()
-replaces=()
-backup=()
-install=
-source=(http://download.gna.org/ksirk/ksirk-1.8beta8.tar.bz2)
-md5sums=(b199a0ce22a64c99144f6449f6403b39)
-
-build() {
-  cd $startdir/src/ksirk-1.8beta1
-  ./configure --prefix=$(kde-config --prefix)
-  make || return 1
-  ./waf.py --destdir=$startdir/pkg install
-}