internal/rosa/mksh: also build lksh

This is better suited for /system/bin/sh. Full mksh is still included, installed at /system/bin/mksh.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/mksh.go

@@ -13,14 +13,20 @@ func (t Toolchain) newMksh() pkg.Artifact {
 		t.Load(Coreutils),
 	), nil, []string{
 		"LDSTATIC=-static",
+		"CPPFLAGS=-DMKSH_DEFAULT_PROFILEDIR=\\\"/system/etc\\\"",
 	}, `
 cd "$(mktemp -d)"
-sh /usr/src/mksh/Build.sh
+sh /usr/src/mksh/Build.sh -r
+CPPFLAGS="${CPPFLAGS} -DMKSH_BINSHPOSIX -DMKSH_BINSHREDUCED" \
+sh /usr/src/mksh/Build.sh -r -L
 ./test.sh -C regress:no-ctty
 
-mkdir -p /work/{bin,system/bin}
-cp mksh /work/system/bin/sh
-ln -vs ../system/bin/sh /work/bin
+mkdir -p /work/system/bin/
+cp -v mksh /work/system/bin/
+cp -v lksh /work/system/bin/sh
+
+mkdir -p /work/bin/
+ln -vs ../system/bin/sh /work/bin/
 `, pkg.Path(AbsUsrSrc.Append("mksh"), false, pkg.NewHTTPGetTar(
 		nil,
 		"https://mbsd.evolvis.org/MirOS/dist/mir/mksh/mksh-R"+version+".tgz",