Squashed 'cde/programs/dtksh/ksh93/' content from commit b16c91f01

git-subtree-dir: cde/programs/dtksh/ksh93
git-subtree-split: b16c91f0120895eaae2618e821cac5b4eda27ac2

src/Mamfile

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+note *
+note * This build file is in the Make Abstract Machine (MAM) language. It was
+note * first generated by nmake, but in the ksh 93u+m distribution we maintain
+note * it manually because nmake had too many problems to keep using. The
+note * Mamfiles are processed by mamake (src/cmd/INIT/mamake.c); we added
+note * indentation to improve readability. The language is documented in
+note * src/cmd/INIT/README-mamake.md.
+note *
+make test
+	make install
+		make all
+			exec - ${MAMAKE} -r '*/*' ${MAMAKEARGS}
+		done all virtual
+	done install virtual
+done test virtual