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>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38809 3c298f89-4303-0410-b956-a3cf2f4a3e73