build: don't include UNIX_PROGS for MINGW

[ognevny]

I'm surely believe that it was committed by mistake

[oech3]

MSYS CI's log said OS=Windows_NT.

[ognevny]

MSYS CI's log said OS=Windows_NT.

MSYS make reports OS as Windows_NT as it should be, that's proper behaviour

[oech3]

With this change, GnuTests lost UNIX_PROGS. So this looks incorrect.

[oech3]

MSYS make reports OS as Windows_NT as it should be, that's proper behaviour

Maybe, should we change MINGW to Windows? (since *_NT includes CYGWIN_NT)

[ognevny]

but how do we fix MINGW build then? with this change everything builds correctly for us

[codspeed-hq]

Merging this PR will degrade performance by 3.25%

⚠️ Different runtime environments detected

Some benchmarks with significant performance changes were compared across different runtime environments,
which may affect the accuracy of the results.

Open the report in CodSpeed to investigate

❌ 1 regressed benchmark
✅ 297 untouched benchmarks
⏩ 48 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	du_max_depth_balanced_tree[(6, 4, 10)]	24.9 ms	25.7 ms	-3.25%

---

_{Comparing ognevny:patch-1 (89ed3f6) with main (53200b3)}

Footnotes

1. 48 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. ↩