user/mach64-drm: 32-bit only; update for mc1

user/mach64-drm/APKBUILD

 # Contributor: A. Wilcox <awilfox@adelielinux.org>
 # Maintainer: A. Wilcox <awilfox@adelielinux.org>
-_kver="5.4.5-mc0"
+_kver="5.4.66-mc1"
 pkgname=mach64-drm
 pkgver=5.6
 pkgrel=0
 pkgdesc="Kernel driver for Mach64 GPUs"
 url=" "
-arch="pmmx ppc x86_64"
+arch="pmmx ppc"
 options="!check !dbg !strip"  # No test suite.
 license="MIT"
 depends="easy-kernel-modules-$_kver"