main/yaboot: remove

Neither the Adelie PPC team or the IBM PPC team have any interest in using yaboot
to boot on PPC/PPC64/PPC64LE machines, and there's no point keeping this around
since it's broken anyway.

On those ports, we always use grub2.

main/yaboot/APKBUILD

@@ -1,40 +0,0 @@
-# Contributor: William Pitcock <nenolod@dereferenced.org>
-# Maintainer: William Pitcock <nenolod@dereferenced.org>
-pkgname=yaboot
-pkgver=1.3.17
-pkgrel=0
-pkgdesc="A bootloader for openfirmware-based machines (new-world macintosh, as well as ibm rs/6000, pseries and openpower)"
-url="http://yaboot.ozlabs.org/"
-arch="powerpc"
-license="GPL-2.0-or-later"
-depends=""
-depends_dev=""
-makedepends="$depends_dev"
-install=""
-subpackages="$pkgname-dev $pkgname-doc"
-source="http://yaboot.ozlabs.org/releases/$pkgname-$pkgver.tar.gz"
-
-_builddir=
-prepare() {
-	local i
-	cd "$_builddir"
-	for i in $source; do
-		case $i in
-		*.patch) msg $i; patch -p1 -i "$srcdir"/$i || return 1;;
-		esac
-	done
-}
-
-build() {
-	cd "$_builddir"
-	make PREFIX="/usr" || return 1
-}
-
-package() {
-	cd "$_builddir"
-	make ROOT="$pkgdir" PREFIX="/usr" install || return 1
-}
-
-md5sums="f599f52d1887a86fd798252d2946f635  yaboot-1.3.17.tar.gz"
-sha256sums="2fb738d8fd48b94ab2534a4fdf63738ad02c1a30f4b2add91f837baff8fa2aa1  yaboot-1.3.17.tar.gz"
-sha512sums="da910c4c6ca2de817342bf4dbcefe2857606043e614782581a86bae206cf6cfe5597ad47aea15369feb60e02d8a4f9f4aa3b12863d715c757584c1f4d7ffb9de  yaboot-1.3.17.tar.gz"