core/linux-rpi to 5.15.89-4

Bump and symlink aarch64 -> arm64 in headers package's $builddir/arch/

core/linux-rpi/PKGBUILD

@@ -5,11 +5,11 @@
 # Contributer: Jan Alexander Steffens (heftig) <heftig@archlinux.org>
 
 pkgbase=linux-rpi
-_commit=56950b317678e7a05f9440b812a7fdda9d5378e8
+_commit=8f1f0ad34428f0ff5879257664c5fe6b950b58a3
 _srcname=linux-${_commit}
 _kernelname=${pkgbase#linux}
 pkgver=5.15.89
-pkgrel=3
+pkgrel=4
 pkgdesc='Linux'
 url="http://www.kernel.org/"
 arch=(armv7h aarch64)
@@ -27,7 +27,7 @@ source=("linux-$pkgver-${_commit:0:10}.tar.gz::https://github.com/raspberrypi/li
         60-linux.hook
         90-linux.hook
 )
-md5sums=('3b4b19b6ad336b2280d81eaa2cb5fdf7'
+md5sums=('0515fc98df67f79aa937c664cda3c71f'
          '3bab7426d8c8818dda8353da3892a41f'
          'f66a7ea3feb708d398ef57e4da4815e9'
          '86d4a35722b5410e3b29fc92dae15d4b'
@@ -181,6 +181,13 @@ _package-headers() {
     rm -r "$_arch"
   done
 
+  if [[ $CARCH == "aarch64" ]]; then
+    echo "Symlinking aarch64 to arm64"
+    # expect aarch64 not arm64 for example:
+    # https://archlinuxarm.org/forum/viewtopic.php?f=60&t=16354
+    ln -sr "$builddir/arch/arm64" "$builddir/arch/aarch64"
+  fi
+
   echo "Removing documentation..."
   rm -r "$builddir/Documentation"