Ports: Switch to new ports system (#594)

Much redundancy is removed from package scripts with this system.
It also supports simple dependency management, uninstalling (through
BSD ports style plist files), cleaning up after itself (with clean,
clean_dist, clean_all commands), etc.

Ports/SDL2/SDL2.sh

@@ -1,16 +0,0 @@
-#!/bin/sh
-PORT_DIR=SDL
-fetch() {
-    run_fetch_git "https://github.com/SerenityOS/SDL"
-}
-configure() {
-    CMAKEOPTS="-DPULSEAUDIO=OFF"
-    run_configure_cmake
-}
-build() {
-    run_make
-}
-install() {
-    run_make_install
-}
-. ../.port_include.sh

Ports/SDL2/package.sh

@@ -0,0 +1,12 @@
+#!/bin/bash ../.port_include.sh
+port=SDL2
+version=serenity-git
+workdir=SDL-master-serenity
+useconfigure=true
+curlopts="-L"
+files="https://github.com/SerenityOS/SDL/archive/master-serenity.tar.gz SDL2-git.tar.gz"
+configopts="-DCMAKE_TOOLCHAIN_FILE=$SERENITY_ROOT/Toolchain/CMakeToolchain.txt -DPULSEAUDIO=OFF"
+
+configure() {
+    run cmake $configopts
+}