[cmake] Update to 3.21.1#18955

Merged

BillyONeal merged 15 commits intomicrosoft:masterfrom

JackBoosY:dev/jack/update_cmake_3.21.0

Aug 12, 2021

Commits on Jul 15, 2021

[cmake] Update to 3.21.0
JackBoosY
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update hash
JackBoosY
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Commits on Jul 17, 2021

Merge remote-tracking branch 'origin/master' into HEAD
BillyONeal
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Commits on Jul 19, 2021

Commits on Jul 21, 2021

Commits on Jul 27, 2021

Merge branch 'master' of https://github.com/microsoft/vcpkg into dev/jack/update_cmake_3.21.0
JackBoosY
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Fix Fix setting ${VAR} to NOTFOUND when no suitable version is found.
JackBoosY
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