Let CRYPTO_mem_leaks{,_fp,_cb}() return -1.

Let CRYPTO_mem_leaks{,_fp,_cb}() return -1.

These functions are no-ops. Their signature was changed by OpenSSL
to allow error checking.  This way we return an error and do not
indicate the (non-)existence of memory leaks.

tested in a bulk by sthen
ok jsing