fix(manifest): move payload-import after gcc and convert to pass1.sh

steps/payload-import-1.0/pass1.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+#
+# SPDX-FileCopyrightText: 2026 live-bootstrap contributors
+# SPDX-License-Identifier: MIT
+
+src_get() {
+    :
+}
+
+src_unpack() {
+    dirname=.
+    cp -r ../src .
+}
+
+src_compile() {
+    gcc -m32 -march=i386 -std=c89 -static -o payload-import src/payload-import.c
+}
+
+src_install() {
+    install -D payload-import "${DESTDIR}${BINDIR}/payload-import"
+}