tpm2-tools: propagate dependencies of selected packages

tpm2-tools: propagate dependencies of selected packages

- C++ (tpm2-tss)
- MMU (dbus, libglib)
- threads (libglib)
- wchar (libglib -> gettext)

Fixes (libglib):
  http://autobuild.buildroot.net/results/786859fccc477de1519d85d8a180626bb8ebe062
  http://autobuild.buildroot.net/results/df6518f331c16b477c6e934914d0e56dc102c228

[Peter: add C++ dependency to config option]
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>