Revert time_t related changes

Michael Bieblrequested to merge
biebl/libcanberra:time64_fixes into debian/latest

Those changes appear to not be necessary. time_t is not exposed in the API/ABI and a-c-c did not detect any issues [1].

[1] https://adrien.dcln.fr/misc/armhf-time_t/2024-02-01T09:53:00/compat_reports/libcanberra-dev/

This reverts commit 04a6b5de.

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