[cmake] sync with https://github.com/llnl/Umpire/pull/1033#537

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evaleev merged 2 commits intomasterfrom

evaleev/cmake/umpire-pr1033

Feb 27, 2026

Commits on Feb 9, 2026

[cmake] sync with https://github.com/llnl/Umpire/pull/1033 to be able to use w/ C++20
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[cmake] sync w/ https://github.com/ValeevGroup/BTAS/pull/186
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