Added xa 6502 cross assembler ebuild

dev-lang/xa65/Manifest

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+DIST xa-2.3.9.tar.gz 151086 BLAKE2B 312d082bf18eebdcd41eb4127a035db5fe2b47121bceadf45aa06e515160cb9233742791447806ee057a1b4e3860ecddda3f85f76d0e9d672dcd00cb8a1871c4 SHA512 9e140192f7daae8b5042a01c81c85f6ec4e53c727fa5af624fbe94a8ce85fbf821a1ee94dc9c11e8087b08a4060010b989f95b77cbcd2b550ab552c3b5455dfe
+EBUILD xa65-2.3.9.ebuild 551 BLAKE2B 7c6048ad858fa696bc89cabbccfe88c0be3fc1f819f55e02225a84c2dbf01d533f00d7d81d7c120f1fe5e3650ee68dc9dd42c9f2617356cf5710d26109bb2e0b SHA512 37e9b027dafa7d3621f558b7134cad12e0c368ff25c74dc037a8fb4fde40e3c006a29450121e226d021c722bcf3a5c507adc64c746d4131beb0d621fdd764867

dev-lang/xa65/xa65-2.3.9.ebuild

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+# Copyright 2019 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+DESCRIPTION="Two-pass cross-assembler for MOS 6502 and compatible CPUs"
+HOMEPAGE="http://www.floodgap.com/retrotech/xa/"
+SRC_URI="http://www.floodgap.com/retrotech/xa/dists/xa-$PV.tar.gz"
+
+LICENSE="GPL2"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE=""
+
+DEPEND=""
+RDEPEND="${DEPEND}"
+BDEPEND=""
+
+src_unpack() {
+	unpack ${A}
+	mv "${WORKDIR}/xa-$PV" "${WORKDIR}/${P}"
+}
+
+src_install() {
+	emake -j1 PREFIX="${EPREFIX}" DESTDIR="${D}/usr" install || die
+}