[libc][stdlib] Implement setenv() with environment management infrastructure#163018

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kaladron wants to merge 3 commits intollvm:mainfrom

kaladron:setenv

Commits on Oct 11, 2025

[libc][stdlib] Implement setenv() with environment management infrastructure
kaladron
authored

Commits on Oct 12, 2025

Remove unsetenv cleanup calls from setenv tests, to be uncommented after unsetenv implementation (coming in subsequent commit)
kaladron
authored
Wrap the files in if(LLVM_LIBC_FULL_BUILD) so that they won't show up on Windows and Mac overlay builds.
kaladron
authored