Drop timestamp in generated source code (#146822)

Fixes #72206

This helps reproducible builds of libomp.so --
probably because LLVM's LTO computed a hash of inputs to generate its
symbol names.

note: if it is desired to keep the timestamp, we could instead use
[`SOURCE_DATE_EPOCH`](https://reproducible-builds.org/docs/source-date-epoch/)
to make it deterministic.

This PR was done while working on [reproducible builds for
openSUSE](https://en.opensuse.org/openSUSE:Reproducible_Builds).

GitOrigin-RevId: b6e113a149bfa196a90a260f69f06b0070bd3670
1 file changed