package/libnss: fix build failure on microblaze

package/libnss: fix build failure on microblaze

By mistake seed.o has been added to public library too, but this way its
dependencies are not taken into account(stubs.o), this way build fails
complaining on missing functions from stubs.o file. Let's fix it by
adding upstream patch:
https://hg.mozilla.org/projects/nss/rev/f46fca8ced7fca6aa6de60e3170b2a3b6b2df565

Fixes:
http://autobuild.buildroot.net/results/4cb/4cbf4c35549a3bfba06222ba509d0263f23a3a2e/

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>