Speedup Makefile on Windows

[Disservin]

The Makefile is notoriously slow on windows, because of new processes being spawned I believe. This
pr improves it a little bit for the help and config-sanity targets, with the latter also improving make -j build because it depends on that. On the same machine ubuntu (wsl) is more than 3 times faster, if there are other improvements we can make I'd be happy to hear about them. Ultimately #5543 also aims to improve this I believe, but it will take some additional time before that lands.

make config-sanity:

    patch: 6.199s
    master: 12.738s


make help:

    patch: 3.1s
    master: 11.49s


make -j build:

    patch: 36s
    master: 43.25s


make -j build:

    master ubuntu: 10s

No functional change

[MinetaS]

Could you test using printf instead of an echo chain? For example:

printf "\n\
        To compile stockfish, type\n\
        \n\
        make -j target [ARCH=arch] [COMP=compiler] [COMPCXX=cxx]\n\
..."

or a set of "%s\n" for better formatting.

[Disservin]

I can do that later but I found the new lines a bit tedious. For the config sanity the big bottleneck now seems to be the net script which takes like 4.5s compared to 1.5s when started directly from the cli.