gdcm / transitive linking

[Mathieu Malaterre <mathieu.malaterre@gmail.com>]

Steve,

  I fixed the issue of transitive linking in GDCM. So next time you do
an upload we can work together to revert all the Build-Depends stuff
you had to add just to be able to link GDCM (technically we should be
back to original state before the USE_SYSTEM_GDCM option).


Cheers
-- 
Mathieu