fix(steps-guix): add libffi build before guile-2.2.4 and wire explicit libffi pkg-config flags

steps-guix/guile-2.2.4/pass1.sh

@@ -7,6 +7,17 @@ src_prepare() {
 }
 
 src_configure() {
+    local pkg_config_path libffi_cflags libffi_libs
+    pkg_config_path="${LIBDIR}/pkgconfig:${PREFIX}/lib/pkgconfig"
+    libffi_cflags="$(PKG_CONFIG_LIBDIR="${pkg_config_path}" PKG_CONFIG_PATH="${pkg_config_path}" \
+        pkg-config --cflags libffi)"
+    libffi_libs="$(PKG_CONFIG_LIBDIR="${pkg_config_path}" PKG_CONFIG_PATH="${pkg_config_path}" \
+        pkg-config --static --libs libffi)"
+
+    PKG_CONFIG_LIBDIR="${pkg_config_path}" \
+    PKG_CONFIG_PATH="${pkg_config_path}" \
+    LIBFFI_CFLAGS="${libffi_cflags}" \
+    LIBFFI_LIBS="${libffi_libs}" \
     ./configure \
         --prefix="${SEED_PREFIX}" \
         --disable-shared \

steps-guix/libffi-3.5.2/pass1.sh

@@ -0,0 +1,19 @@
+# SPDX-FileCopyrightText: 2022 Andrius Štikonas <andrius@stikonas.eu>
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+src_prepare() {
+    rm doc/libffi.{pdf,info}
+
+    autoreconf-2.71 -fi
+}
+
+src_configure() {
+    ./configure \
+        --prefix="${PREFIX}" \
+        --libdir="${LIBDIR}" \
+        --build="${TARGET}" \
+        --disable-shared \
+        --with-gcc-arch=generic \
+        --enable-pax_emutramp
+}

steps-guix/libffi-3.5.2/sources

@@ -0,0 +1 @@
+f https://github.com/libffi/libffi/releases/download/v3.5.2/libffi-3.5.2.tar.gz f3a3082a23b37c293a4fcd1053147b371f2ff91fa7ea1b2a52e335676bac82dc

steps-guix/manifest

@@ -55,6 +55,7 @@ build: patch-2.7.6
 build: bash-5.3-1
 build: static-binaries-0-i686-linux
 # Build guile-static-stripped-2.2.4-i686-linux.tar.xz
+build: libffi-3.5.2
 build: guile-2.2.4
 # Build mes-minimal-stripped-0.19-i686-linux.tar.xz
 build: mes-minimal-stripped-0.19-i686-linux