Add luajit.

This is source-compatible with lua-5.1, but faster!
There is also a separate native interface with less overhead.

dev-lang/luajit/luajit-2.0.2.recipe

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+SUMMARY="LuaJIT is a Just-In-Time Compiler (JIT) for the Lua programming language."
+HOMEPAGE="http://luajit.org/luajit.html"
+SRC_URI="http://luajit.org/download/LuaJIT-$portVersion.tar.gz"
+CHECKSUM_MD5="112dfb82548b03377fbefbba2e0e3a5b"
+REVISION="1"
+ARCHITECTURES="x86 x86_gcc2"
+SECONDARY_ARCHITECTURES="x86"
+PROVIDES="
+	luajit$secondaryArchSuffix = $portVersion compat >= 5.1
+	lib:libluajit_5.1$secondaryArchSuffix = $portVersion compat >= 2
+	cmd:luajit_$portVersion$secondaryArchSuffix
+	cmd:luajit$secondaryArchSuffix
+	"
+
+REQUIRES="
+	haiku$secondaryArchSuffix >= $haikuVersion
+	"
+BUILD_PREREQUIRES="
+	haiku${secondaryArchSuffix}_devel >= $haikuVersion
+	cmd:make
+	cmd:gcc$secondaryArchSuffix
+	"
+
+PROVIDES_devel="
+	luajit${secondaryArchSuffix}_devel = $portVersion compat >= 5.1
+	devel:libluajit_5.1$secondaryArchSuffix = $portVersion compat >= 2
+	"
+
+REQUIRES_devel="
+	luajit$secondaryArchSuffix == $portVersion base
+	"
+
+PATCHES="luajit-$portVersion.patchset"
+
+SOURCE_DIR="LuaJIT-$portVersion"
+BUILD()
+{
+	# Use amalg target as recommended on luajit homepage to get better performance
+	make $jobArgs amalg PREFIX=$prefix
+}
+
+INSTALL()
+{
+	make install PREFIX=$prefix INSTALL_LIB="$libDir" INSTALL_BIN="$binDir" \
+		INSTALL_INC="$includeDir" INSTALL_SHARE="$dataDir" \
+		INSTALL_MAN="$manDir/man1" INSTALL_LMOD="$dataDir/lua/5.1"
+
+	ln -s $libDir/libluajit-5.1.so.2.0.2 $libDir/libluajit-5.1.so.2
+	prepareInstalledDevelLib libluajit-5.1
+	packageEntries devel $developDir
+}
+LICENSE="MIT"
+COPYRIGHT="2005-2013, Mike Pall"
+DESCRIPTION="
+LuaJIT is a Just-In-Time Compiler (JIT) for the Lua programming language.
+
+Lua is a powerful, dynamic and light-weight programming language. It may be \
+embedded or used as a general-purpose, stand-alone language.
+"