ports: Add SDL3 port

I've been planning on doing this for a long time :D This is mostly based
on the SDL2 backend but there are a bunch of fixes

ports/SDL3/build.sh

@@ -0,0 +1,22 @@
+#!/bin/bash ../install.sh
+
+NAME='SDL3'
+VERSION='3.4.10'
+DOWNLOAD_URL="https://github.com/libsdl-org/SDL/releases/download/release-$VERSION/SDL3-$VERSION.tar.gz#12b34280415ec8418c864408b93d008a20a6530687ee613d60bfbd20411f2785"
+DEPENDENCIES=('mesa' 'libiconv')
+
+configure() {
+	cmake --fresh -S . -B build -G Ninja \
+		--toolchain="$BANAN_TOOLCHAIN_DIR/Toolchain.txt" \
+		-DCMAKE_INSTALL_PREFIX='/usr' \
+		-DCMAKE_BUILD_TYPE=Release \
+		 || exit 1
+}
+
+build() {
+	cmake --build build || exit 1
+}
+
+install() {
+	DESTDIR="$DESTDIR" cmake --install build || exit 1
+}