testing/atari800: new aport

https://atari800.github.io/
Atari 8-bit computer emulator.

testing/atari800/APKBUILD

+# Contributor: Paul Bredbury <brebs@sent.com>
+pkgname=atari800
+pkgver=4.0.0
+pkgrel=0
+pkgdesc="Atari 8-bit computer emulator"
+url="https://atari800.github.io/"
+arch="x86_64"
+license="GPL-2.0-or-later"
+depends=""
+makedepends="autoconf automake sdl-dev mesa-dev unzip"
+options="!check" # No test suite
+subpackages="$pkgname-doc"
+source="https://github.com/$pkgname/$pkgname/archive/ATARI800_${pkgver//./_}.tar.gz"
+builddir="$srcdir/atari800-ATARI800_${pkgver//./_}/src"
+
+prepare() {
+	default_prepare
+	./autogen.sh
+}
+
+build() {
+	cd "$builddir"
+	./configure --prefix=/usr
+	make
+}
+
+package() {
+	cd "$builddir"
+	make DESTDIR="$pkgdir" install
+}
+
+sha512sums="58725c099d421ceeadb1d37a370c61d6846827af6d87d131db3326016be48b4b1193acbc0cfdd54dc396bb97c760b6338006ca30b28a9f74eb881274056bd589  ATARI800_4_0_0.tar.gz"