gendsa: remove unnecessary OPENSSL_SUPPRESS_DEPRECATED definition

Reviewed-by: NPaul Yang <kaishen.yy@antfin.com>
(Merged from https://github.com/openssl/openssl/pull/11570)

apps/gendsa.c

@@ -7,9 +7,6 @@
  * https://www.openssl.org/source/license.html
  */
 
-/* We need to use some deprecated APIs */
-#define OPENSSL_SUPPRESS_DEPRECATED
-
 #include <openssl/opensslconf.h>
 
 #include <stdio.h>