Port Ben's parallell Makefile hack to Windows

jom is an nmake clone that does parallell building, via the same -j
argument as GNU make.  To make it work, we need to apply the same
dependeency build up as done in 27c40a93

Fixes #3272

Reviewed-by: Rich Salz <rsalz@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/3277)