windows: use jom instead of nmake to build openssl if availableHEADmaster

jom (https://wiki.qt.io/Jom) is a parallel version of nmake that
especially helps with building openssl since everything is compiled
individually/the compiler cannot use parallelism either.
Also in a LibreOffice build there's not much else that can be done in
parallel/other stuff requires openssl to be built to continue.

Change-Id: Ib16b0f947991a1d3255aeae7dc5d9bdee0b157a0
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/177743
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Tested-by: Jenkins

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