Add the start of a simple ports infrastructure

Ports/.port_include.sh

@@ -0,0 +1,78 @@
+#!/bin/sh
+
+# This script contains common helpers for all ports.
+set -e
+
+if [ -z "$MAKEOPTS" ]; then
+    MAKEOPTS="-j $(nproc)"
+fi
+if [ -z "$INSTALLOPTS" ]; then
+    MAKEOPTS="-j $(nproc)"
+fi
+if [ -z "$SERENITY_ROOT" ]; then
+    echo "You must have source'd UseIt.sh to build any ports!"
+    exit 1
+fi
+
+if [ -z "$PORT_DIR" ]; then
+    echo "Must set PORT_DIR to where the source should be cloned."
+    exit 1
+fi
+
+function run_fetch_git() {
+    if [ -d "$PORT_DIR/.git" ]; then
+        (cd "$PORT_DIR" && git fetch && git reset --hard FETCH_HEAD)
+    else
+        git clone "$1" "$PORT_DIR"
+    fi
+}
+
+function run_configure_cmake() {
+    (
+        cd "$PORT_DIR"
+        cmake -DCMAKE_TOOLCHAIN_FILE="$SERENITY_ROOT/Toolchain/CMakeToolchain.txt" .
+    )
+}
+
+function run_configure_autotools() {
+    (
+        cd "$PORT_DIR"
+        ./configure --host=i686-pc-serenity
+    )
+}
+
+function run_make() {
+    (
+        cd "$PORT_DIR"
+        make $MAKEOPTS "$@"
+    )
+}
+
+function run_make_install() {
+    (
+        cd "$PORT_DIR"
+        make $INSTALLOPTS install "$@"
+    )
+}
+
+if [ -z "$1" ]; then
+    fetch
+    configure
+    build
+    install
+    exit 0
+fi
+
+if [ "$1" == "fetch" ]; then
+    fetch
+elif [ "$1" == "configure" ]; then
+    configure
+elif [ "$1" == "build" ]; then
+    build
+elif [ "$1" == "install" ]; then
+    install
+else
+    echo "Unknown verb: $1"
+    echo "Supported: (one of) fetch configure build install"
+    exit 1
+fi