fix(steps-guix): add expat-2.7.4 before dbus and pin dbus cmake search paths to PREFIX

steps-guix/expat-2.7.4/pass1.sh

@@ -0,0 +1,29 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_prepare() {
+    default
+}
+
+src_configure() {
+    local host_triplet
+    host_triplet="$(gcc -dumpmachine)"
+
+    PATH="${PREFIX}/bin:/usr/bin:/bin" \
+    PKG_CONFIG_PATH="${LIBDIR}/pkgconfig:${PREFIX}/lib/pkgconfig" \
+    ./configure \
+        --prefix="${PREFIX}" \
+        --libdir="${LIBDIR}" \
+        --includedir="${PREFIX}/include" \
+        --host="${host_triplet}" \
+        --build="${host_triplet}" \
+        --enable-static \
+        --enable-shared
+}
+
+src_compile() {
+    default_src_compile
+}
+
+src_install() {
+    default_src_install
+}

steps-guix/expat-2.7.4/sources

@@ -0,0 +1 @@
+f https://github.com/libexpat/libexpat/releases/download/R_2_7_4/expat-2.7.4.tar.gz 461ecc8aa98ab1a68c2db788175665d1a4db640dc05bf0e289b6ea17122144ec expat-2.7.4.tar.gz