There is no reason to copy 1000s of files to $(OUTDIR)/inc when we can
easily include them from $(WORKDIR).

Change-Id: I133ab6506ba76af132143b982f056e652c09d8f5
Reviewed-on: https://gerrit.libreoffice.org/3505Reviewed-by: David Tardon <dtardon@redhat.com>
Tested-by: David Tardon <dtardon@redhat.com>