Bug#666743: draft implementation for a Multi-Arch: foreign interface to gcc

[Matthias Klose]

looking at this patch:

-       dh_installdocs -p$(p_gdc)
-       dh_installchangelogs -p$(p_gdc) src/gcc/d/ChangeLog
+       debian/dh_doclink -p$(p_gdc_n) $(p_xbase)

doesn't work, replacing the doc directory with a symlink.