Ports: Add Genemu

This is a Basic Genesis / MegaDrive Emulator, that only requires
SDL2 to run it.

Usage: genemu /path/to/game.bin

Ports/genemu/package.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env -S bash ../.port_include.sh
+
+port="genemu"
+version="${port}-git"
+workdir="${port}-master"
+useconfigure=true
+files="https://github.com/rasky/genemu/archive/master.tar.gz ${version}.tar.gz"
+configopts="-DCMAKE_TOOLCHAIN_FILE=${SERENITY_ROOT}/Toolchain/CMakeToolchain.txt"
+depends="SDL2"
+
+configure() {
+    run cmake ${configopts}
+}
+
+install() {
+    run make install
+}