Add Guix step including bootstrap bin, build guix, build iso and fix some small bug

steps-guix/xz-5.2.4/pass1.sh

@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+SEED_PREFIX="/bootstrap-seeds/xz-5.2.4"
+
+src_configure() {
+    ./configure \
+        --prefix="${SEED_PREFIX}" \
+        --disable-shared \
+        --enable-static \
+        --disable-nls
+}
+
+src_compile() {
+    default_src_compile
+}
+
+src_install() {
+    make DESTDIR="${DESTDIR}" install
+}

steps-guix/xz-5.2.4/sources

@@ -0,0 +1 @@
+f https://tukaani.org/xz/xz-5.2.4.tar.gz b512f3b726d3b37b6dc4c8570e137b9311e7552e8ccbab4d39d47ce5f4177145