[OpenSSL] OpenSSL 1.1.0f is now available, including various bug fixes (no security fixes)

OpenSSL 1.1.0f is now available, including various bug fixes (no security fixes)

Changes between 1.1.0e and 1.1.0f [25 May 2017]

*) Have 'config' recognise 64-bit mingw and choose 'mingw64' as the target
platform rather than 'mingw'.
[Richard Levitte]

*) Remove the VMS-specific reimplementation of gmtime from crypto/o_times.c.
VMS C's RTL has a fully up to date gmtime() and gmtime_r() since V7.1,
which is the minimum version we support.
[Richard Levitte]