ports: Add pre_configure to build system

We have post_configure, so why not this :)

ports/install.sh

@@ -50,11 +50,17 @@ clean() {
 	find . -mindepth 1 -maxdepth 1 -not -name 'patches' -not -name 'build.sh' -exec rm -rf {} +
 }
 
+pre_configure() {
+	:
+}
+
 post_configure() {
 	:
 }
 
 configure() {
+	pre_configure
+
 	configure_options=("--host=$BANAN_ARCH-pc-banan_os" '--prefix=/usr')
 	configure_options+=("${CONFIGURE_OPTIONS[@]}")
 	./configure "${configure_options[@]}" || exit 1