[openssl/openssl] e4d8ea: Add an EVP signature demo using DSA

[faramir-dev]

  Branch: refs/heads/openssl-3.1
  Home:   https://github.com/openssl/openssl
  Commit: e4d8eaac7e2af4719adfc58397b7c7115d45b0bb
      https://github.com/openssl/openssl/commit/e4d8eaac7e2af4719adfc58397b7c7115d45b0bb
  Author: Daniel Fiala <daniel at openssl.org>
  Date:   2022-11-22 (Tue, 22 Nov 2022)

  Changed paths:
    A demos/signature/EVP_DSA_Signature_demo.c
    A demos/signature/EVP_EC_Signature_demo.c
    A demos/signature/EVP_EC_Signature_demo.h
    R demos/signature/EVP_Signature_demo.c
    R demos/signature/EVP_Signature_demo.h
    M demos/signature/Makefile

  Log Message:
  -----------
  Add an EVP signature demo using DSA

Fixes openssl#14114

Reviewed-by: Paul Dale <pauli at openssl.org>
Reviewed-by: Shane Lontis <shane.lontis at oracle.com>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/19492)

(cherry picked from commit 858b5d12b85b0639519d21206c9da7e1bb976a00)