Martin Storsjö 3976b3af59 github: Set -DCMAKE_INSTALL_MESSAGE=NEVER when testing libcxx ...

This matches what 28851edf164a337c334755ae33fd58f03cffd5a2 in
llvm-project did.

When setting up the built libcxx files for testing, the built
files are installed into a temporary test root, and the install of
them litters the build log with mostly uninteresting output.

2025-04-20 23:27:18 +03:00

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github: Set -DCMAKE_INSTALL_MESSAGE=NEVER when testing libcxx

2025-04-20 23:27:18 +03:00