Return smaller of ret and f.

PR#3418.
apps/speed.c: add multi-block benchmark.
s3_pkt.c: fix typo.
sha512-x86_64.pl: fix typo.

PR: #3431
Fixed error in pod files with latest versions of pod2man
Added reference to platform specific cryptographic acceleration such as AES-NI
Sanity check keylength in PVK files.

PR#2277
s_server usage for certificate status requests
Document certificate status request options.
Usage for -hack and -prexit -verify_return_error
Update API to use (char *) for email addresses and hostnames

Reduces number of silly casts in OpenSSL code and likely most
applications.  Consistent with (char *) for "peername" value from
X509_check_host() and X509_VERIFY_PARAM_get0_peername().
Improve X509_check_host() documentation.

Based on feedback from Jeffrey Walton.