Added the 2020.0.1 version of AT&T ksh93 shell

ast-ksh/DESCR

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+# KSH93
+
+This repository contains the AT&T Software Technology (AST) toolkit
+from AT&T Research.  As of November 2017 the development focus has
+been shifted to the `ksh` (or `ksh93`) command and supporting code required
+to build it.
+
+The non-ksh code of the AST project is no longer being actively
+maintained. If you are interested in the non-ksh code see below for
+details on which branches contain the full AST code base.
+
+The project only supports systems where the compiler and underlying
+hardware is ASCII compatible. This includes Linux on IBM zSeries but not
+z/OS. The nascent, incomplete, support for EBCDIC has been removed. See
+[issue #742](https://github.com/att/ast/issues/742).

ast-ksh/Makefile

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+# $NetBSD$
+
+GITHUB_PROJECT=	ast
+GITHUB_TAG=	2020.0.0
+DISTNAME=	2020.0.0
+PKGNAME=	${GITHUB_PROJECT}-${DISTNAME}
+CATEGORIES=	shells
+MASTER_SITES=	${MASTER_SITE_GITHUB:=att/}
+DIST_SUBDIR=	${GITHUB_PROJECT}
+
+MAINTAINER=	pkgsrc-users@NetBSD.org
+HOMEPAGE=	https://github.com/att/ast/
+COMMENT=	Official AT&T release of KornShell 93
+LICENSE=	epl-v1.0
+
+USE_TOOLS+=	pkg-config msgfmt
+USE_LANGUAGES=	c c++
+
+
+WRKSRC=	${WRKDIR}/ast-2020.0.0
+
+do-install:
+	cp ${WRKSRC}/output/src/cmd/ksh93/ksh 			\
+	${DESTDIR}${PREFIX}/bin/ksh93;                          \
+
+.include "../../devel/meson/build.mk"
+.include "../../mk/bsd.pkg.mk"

ast-ksh/PLIST

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+@comment $NetBSD$
+bin/ksh
+bin/ksh93
+bin/shcomp
+man/man1/ksh.1

ast-ksh/distinfo

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+$NetBSD$
+
+SHA1 (ast/2020.0.0.tar.gz) = eeafab127fd008663b3c4cf68eeffd0a336c4aa0
+RMD160 (ast/2020.0.0.tar.gz) = 1df7ae37037d89a6bb16cc7accbfe7035336a8f6
+SHA512 (ast/2020.0.0.tar.gz) = 68f9bfc47255f6c7846827d4b4fbd4bfa88f1498e22a44efdf344e6c4ecf55990ea7d26a9127aa8f077f845924714ff34a4c16e6dcb82788db54da80e2943623
+Size (ast/2020.0.0.tar.gz) = 2022861 bytes