Add recipe for mksh.

* There is one failing test.

app-shells/mksh/mksh-r50c.recipe

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+SUMMARY="The MirBSD Korn Shell"
+DESCRIPTION="An actively developed free implementation of the Korn Shell \
+programming language and a successor to the Public Domain Korn Shell (pdksh).
+
+mksh targets users who desire a compact, fast, reliable, secure shell not cut \
+off modern extensions; a shell with Unicode support; an actively developed, \
+current, and portable product; one with developers that listen to their users’ \
+requests and implement them if they actually make sense.
+
+mksh aims to replace pdksh in all but very rare use cases (such as support for \
+checking the Unix mbox) and in all operating environments (thus including \
+patches from pdksh on e.g. Debian).
+"
+HOMEPAGE="https://www.mirbsd.org/mksh.htm"
+LICENSE="BSD (3-clause)"
+COPYRIGHT="2002-2014 Thorsten Glaser"
+
+SRC_URI="https://www.mirbsd.org/MirOS/dist/mir/mksh/mksh-R50c.tgz"
+CHECKSUM_SHA256="494ed3339e4d5c490e32b3c27dd3b642e493d86982ac60e15c8d6769e3b598ec"
+SOURCE_DIR="mksh"
+
+REVISION="1"
+ARCHITECTURES="x86_gcc2"
+
+PROVIDES="
+	mksh = $portVersion
+	cmd:mksh
+	cmd:sh
+"
+
+REQUIRES="
+	haiku >= $haikuVersion
+"
+
+BUILD_PREREQUIRES="
+	haiku_devel >= $haikuVersion
+	cmd:ed
+	cmd:gcc
+	cmd:grep
+	cmd:install
+	cmd:make
+	cmd:nroff
+	cmd:perl
+"
+
+BUILD()
+{
+	sh Build.sh
+}
+
+INSTALL()
+{
+	mkdir -p $binDir
+	mkdir -p $docDir/mksh/examples/
+	mkdir -p $manDir/man1
+
+	# Installing the shell:
+	install -c -s -m 555 mksh $binDir/mksh
+	# grep -x /bin/mksh /etc/shells >/dev/null || echo /bin/mksh >>/etc/shells
+	install -c -m 444 dot.mkshrc $docDir/mksh/examples/
+
+	# Installing the manual:
+	install -c -m 444 mksh.1 $manDir/man1/mksh.1
+
+	ln -s mksh $binDir/sh 
+}
+
+TEST()
+{
+	./test.sh
+}