openssl: add support for RIPEMD/160

RIPEMD is needed to update erlang and i'd like to enable RIPEMD160 support in openssh.

Size compared:

openssl without RIPEMD/160 support:
647K 29. Okt 20:00 bin/ar71xx/packages/libopenssl_1.0.1e-2_ar71xx.ipk

openssl with RIPEMD/160 support:
652K  8. Nov 15:11 bin/ar71xx/packages/libopenssl_1.0.1e-2_ar71xx.ipk

So the file size just grows ~5kb, which shouldn't be a problem.

Signed-off-by: Peter Wagner <tripolar@gmx.at>

SVN-Revision: 38809