Make OPENSSL_malloc_init() a no-op

Making this a no-op removes a potential infinite loop than can occur in
some situations.

Fixes #2865

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/8167)

(cherry picked from commit ef45aa14c5af024fcb8bef1c9007f3d1c115bd85)