fix(steps-guix): add libevent-2.1.12 before avahi dependency chain

steps-guix/libevent-2.1.12/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/libevent-2.1.12/sources

@@ -0,0 +1 @@
+f https://github.com/libevent/libevent/releases/download/release-2.1.12-stable/libevent-2.1.12-stable.tar.gz 92e6de1be9ec176428fd2367677e61ceffc2ee1cb119035037a27d346b0403bb libevent-2.1.12-stable.tar.gz