It has a different semantic, maybe we should just do a zero memset,
letting Behdad to decide.

Probably we should just remove timeout when running tsan and vaglrind here, the flaky bots

[cmake] Fix CMake build on newer CMake versions

Unfortunately, newer CMake versions die during regex variable extraction, causing the build to fail.

This is caused by the lack of escaping used around variables in the extract_make_variable function, causing these variables to be automatically unwrapped into empty strings.