cross-powerpc64-linux-musl: unrestrict to all 64bit

srcpkgs/cross-powerpc64-linux-musl/template

@@ -37,7 +37,14 @@ makedepends="zlib-devel gmp-devel mpfr-devel libmpc-devel isl15-devel"
 nostrip_files="libcaf_single.a libgcc.a libgcov.a libgcc_eh.a
  libgnarl_pic.a libgnarl.a libgnat_pic.a libgnat.a"
 depends="${pkgname}-libc-${version}_${revision}"
-archs="x86_64* ppc64le ppc64"
+
+if [ "$XBPS_TARGET_WORDSIZE" != "64" ]; then
+        broken="64-bit crosstoolchain only available on 64-bit host"
+fi
+
+if [ "$XBPS_TARGET_MACHINE" = "ppc64-musl" ]; then
+	broken="Can't build crosstoolchain to itself"
+fi
 
 _apply_patch() {
 	local args="$1" pname="$(basename $2)"