Add the .der files used by yaSSL benchmark

extra/yassl/taocrypt/benchmark/dh1024.der:
  New BitKeeper file ``extra/yassl/taocrypt/benchmark/dh1024.der''
extra/yassl/taocrypt/benchmark/dsa1024.der:
  New BitKeeper file ``extra/yassl/taocrypt/benchmark/dsa1024.der''
extra/yassl/taocrypt/benchmark/rsa1024.der:
  New BitKeeper file ``extra/yassl/taocrypt/benchmark/rsa1024.der''