stockfish: new recipe for a chess engine (#1052)

Adding new recipe for stockfish, a chess engine claimed to be strongest in the world.

games-board/stockfish/stockfish-8.recipe

@@ -0,0 +1,67 @@
+SUMMARY="A chess engine claimed to be strongest in the world"
+DESCRIPTION="Stockfish is a free UCI chess engine derived from Glaurung 2.1. It \
+is not a complete chess program and requires some UCI-compatible GUI (e.g. \
+XBoard with PolyGlot, eboard, Arena, Sigma Chess, Shredder, ChessPartner or \
+Fritz) in order to be used comfortably. Read the documentation for your GUI of \
+choice for information about how to use Stockfish with it."
+HOMEPAGE="https://www.stockfishchess.org/"
+COPYRIGHT="2004-2008 Tord Romstad (Glaurung author)
+	2008-2016 Marco Costalba, Joona Kiiski, Gary Linscott, Tord Romstad"
+LICENSE="GNU GPL v3"
+REVISION="1"
+SOURCE_URI="https://github.com/official-stockfish/Stockfish/archive/sf_$portVersion.tar.gz"
+CHECKSUM_SHA256="e2b77d801d8837c22c2391b8cae08622c1434a2bb5947ddb08b081e1ad35c76c"
+SOURCE_DIR="Stockfish-sf_$portVersion"
+
+ARCHITECTURES="!x86_gcc2 x86 x86_64 ?arm ?ppc"
+SECONDARY_ARCHITECTURES="!x86_gcc2 x86"
+
+if [ "$targetArchitecture" != x86_gcc2 ]; then
+	commandSuffix=$secondaryArchSuffix
+	commandBinDir=$binDir
+else
+	commandSuffix=
+	commandBinDir=$prefix/bin
+fi
+case "$effectiveTargetArchitecture" in
+	x86) commandArch=x86-32;;
+	x86_64) commandArch=x86-64;;
+	arm) commandArch=armv7;;
+	ppc) commandArch=ppc-32;;
+esac
+
+PROVIDES="
+	stockfish$secondaryArchSuffix = $portVersion
+	cmd:stockfish$commandSuffix = $portVersion
+	"
+REQUIRES="
+	haiku$secondaryArchSuffix
+	"
+
+BUILD_REQUIRES="
+	haiku${secondaryArchSuffix}_devel
+	"
+BUILD_PREREQUIRES="
+	cmd:gcc$secondaryArchSuffix
+	cmd:make
+	"
+
+BUILD()
+{
+	make -C src build ARCH=$commandArch
+}
+
+INSTALL()
+{
+	install -d $docDir
+	install -t $docDir AUTHORS Readme.md
+
+	make -C src install BINDIR=$commandBinDir
+}
+
+TEST()
+{
+	test `src/stockfish bench 2>&1 1>/dev/null \
+		| sed -n -e "s/^Nodes searched *: *//p"` \
+		-eq 5926706
+}