free cleanup almost the finale

Add OPENSSL_clear_free which merges cleanse and free.
(Names was picked to be similar to BN_clear_free, etc.)
Removed OPENSSL_freeFunc macro.
Fixed the small simple ones that are left:
        CRYPTO_free CRYPTO_free_locked OPENSSL_free_locked

Reviewed-by: Richard Levitte <levitte@openssl.org>

ssl/s3_lib.c

@@ -3138,8 +3138,7 @@ void ssl3_free(SSL *s)
 #ifndef OPENSSL_NO_SRP
     SSL_SRP_CTX_free(s);
 #endif
-    OPENSSL_cleanse(s->s3, sizeof *s->s3);
-    OPENSSL_free(s->s3);
+    OPENSSL_clear_free(s->s3, sizeof *s->s3);
     s->s3 = NULL;
 }