A number of includes were removed from evp.h some time ago. The reason

was that they weren't really needed any more for EVP itself.  However,
it seems like soma applications (I know about OpenSSH, but there may
be more) used evp.h as the 'load all' header file, which makes sense
since we try our best to promote the use of EVP instead of the lower
level crypto algorithms.  Therefore, I put the inclusions back so
the application authors don't get too shocked by all the errors they
would otherwise get.

Thanks to Theo de Raadt for making us aware of this.