Add msys-libxml2 package

The stock package by upstream mingw always crashed on invocation
of xsltproc linking to it.

This compilate works with xsltproc.

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Add msys-getopt package

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Add msys-docbook package

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Add msys-xmlto package

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Add msys-libxslt package

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Add msys-asciidoc package

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>
Build the documentation

Signed-off-by: Thomas Braun <thomas.braun@byte-physics.de>