in particular, libgpg-error and libassuan
This only downloads and unpacks the tarball. Building them needs
some work still

Change-Id: I562fd01571929ddfb47a319038f88ea8dbfb4bdd
Reviewed-on: https://gerrit.libreoffice.org/33712Reviewed-by: Siegmund Gorr <siegmund.gorr@cib.de>
Tested-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>