Configuration: only produce a new configdata.pm if it has changed contents

Configuration: only produce a new configdata.pm if it has changed contents

The goal is to avoid having too much of the OpenSSL source rebuilt
because configdata.pm got a new time stamp.  The conditions for
updating configdata.pm are now:

1.  its time stamp is older than Configure's, or...
2.  its contents has changed.

Fixes #16377

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Todd Short <todd.short@me.com>
(Merged from https://github.com/openssl/openssl/pull/16378)

(cherry picked from commit 764cf5b26306a8712e8b3d41599c44dc5ed07a25)