Remove an old, impractical TODO

Given OpenSSL puts it all in one header, I don't think we can ever make
<openssl/evp.h> stop including <openssl/digest.h>. Best we can do is
move the public/private key stuff into its own header and make
<openssl/evp.h> be the compat one.

Change-Id: I60310630657513a1cb410cd401ae7e80b1c16913
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/81408
Commit-Queue: Lily Chen <chlily@google.com>
Reviewed-by: Lily Chen <chlily@google.com>
Auto-Submit: David Benjamin <davidben@google.com>

include/openssl/evp.h

diff --git a/include/openssl/evp.h b/include/openssl/evp.h
index 0d999a2..8ce51fa 100644
--- a/include/openssl/evp.h
+++ b/include/openssl/evp.h
@@ -21,8 +21,6 @@
 
 // OpenSSL included digest and cipher functions in this header so we include
 // them for users that still expect that.
-//
-// TODO(fork): clean up callers so that they include what they use.
 #include <openssl/aead.h>
 #include <openssl/base64.h>
 #include <openssl/cipher.h>