Don't assume that sizeof(time_t) == sizeof(long) #2376

Job	Run time
build on fedora:40 (gcc, true)	1m 39s
build on fedora:40 (clang, false)	2m 9s
build on fedora:39 (gcc, false)	2m 3s
build on ubuntu:24.04 (gcc,false)	1m 29s
build on fedora:39 (clang, false)	2m 3s
build on ubuntu:24.04 (clang,false)	1m 41s
build on ubuntu:23.10 (gcc,false)	1m 14s
build on macos (macos-latest)	42s
build on ubuntu:23.10 (clang,false)	1m 29s
build on macos (macos-latest-xlarge)	46s
build on ubuntu:22.04 (gcc,false)	1m 14s
build on ubuntu:22.04 (clang,true)	1m 32s
build on ubuntu:20.04 (gcc,false)	1m 26s
build on ubuntu:20.04 (clang,false)	1m 31s
build on debian:12 (gcc,false)	1m 37s
build on debian:12 (clang,false)	1m 30s
build on debian:11 (gcc,false)	1m 16s
build on debian:11 (clang,false)	1m 43s
run unit tests (ubuntu:22.04, clang)	50s
run unit tests (fedora:40, gcc)	35s
	28m 29s

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