GLUED: renamed packages to rules, cfg_dir_packages to cfg_dir_rules.

rules/libffi/default.bash

@@ -0,0 +1,22 @@
+source "$pkg_common"
+
+configure()
+{
+    "../libffi-$version/configure" \
+        --target="$cfg_target_canonical" \
+        --host="$cfg_target_canonical" \
+        --build="$cfg_host_canonical" \
+        --prefix="$cfg_dir_toolchain_sysroot/usr" \
+        --disable-static \
+        --enable-shared
+}
+
+build()
+{
+    $cmd_make
+}
+
+host_install()
+{
+    $cmd_make install
+}