stubdom: fix link farm runes

stubdom: fix link farm runes

Previously in the three problematic libraries all public headers were
linked to source code directory. We should have created an include
directory for each library and linked public headers there.

Note that there was no breakage for those three libraries before this
patch. This patch merely changes the location headers are linked to so
that all libraries follow the same pattern.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Acked-by: Samuel Thibault <samuel.thibault@ens-lyon.org>