Update RIPEMD detection to use round constants.

[Ek0n]

This prevents detecting SHA1 as RIPEMD. Tested with OpenSSL and Nettle.

Here is an example of running it on my system:

yara -i RIPEMD160_Constants -N -r crypto/crypto_signatures.yar /usr/lib/x86_64-linux-gnu/
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/libgcrypt.so.20.4.2
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/libnettle.a
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/ruby/3.1.0/digest/rmd160.so
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/libmd.so.0.1.0
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/libmd.a
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/libnettle.so.8.8
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/libcrypto.so.3
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/libgcrypt.a
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/libavutil.so.58.2.100
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/libmhash.so.2.0.1
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/libmbedcrypto.so.2.28.3
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/librhash.so.0
RIPEMD160_Constants /usr/lib/x86_64-linux-gnu/libcrypto.a