Allow to replace ln -fs and hardlink on Windows by default

[oech3]

Allow to replace ln -fs for multicall-binary with any command.
make LN=ln fixes argv[0] .
Closes #7928

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/misc/tee (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)

[codspeed-hq]

CodSpeed Performance Report

Merging #8790 will not alter performance

_{Comparing oech3:wrap-ln (d213e49) with main (be25344)}

Summary

✅ 69 untouched
⏩ 73 skipped¹

Footnotes

1. 73 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

[oech3]

@ognevny Does uutils-coreutils of MSYS2 need to have hardlinks of multi-call binary by default?

[ognevny]

multicall binary uses symlinks. there are problems with shipping them, so we use "classical" approach with distributing individual binaries. https://www.msys2.org/docs/symlinks/

edit: oh, I see. hard links are acceptable for us, because they are supported in older versions of Windows

[oech3]

I don't know does pacman of MSYS2 support hardlink. If supported, I'll make LN=ln default on win.

[ognevny]

I don't know does pacman of MSYS2 support hardlink

it's supported. we have a whole package with hardlinks!

[oech3]

Failing tests by network err: #8787 (comment)

[github-actions]

GNU testsuite comparison:

Skipping an intermittent issue tests/timeout/timeout (passes in this run but fails in the 'main' branch)

[github-actions]

GNU testsuite comparison:

Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)

[oech3]

@ognevny It seems hardlink patch is not enough and MULTICALL=y fails on MSYS2 because of missing gmake.exe. pacman -F gmake.exe returns none. Simply sed -i "s/gmake/make/" did not help.

[ognevny]

missing gmake.exe. pacman -F gmake.exe returns none

gmake is also not presented on Archlinux, so it shouldn't be used at all

[oech3]

It seems gmake err happen if I tried to backport hardlink feature by sed.
I can build MULTICALL=y with manually applied patch on MSYS2.