Work on build-tarball. #125

Job	Run time
build-tarball	6m 11s
make check on Ubuntu GNU/Linux	3m 27s
make check on CentOS GNU/Linux	3m 18s
make check on AlmaLinux GNU/Linux	3m 35s
make check on Alpine Linux	3m 37s
make check on OpenBSD	7m 31s
make check on macOS (macos-13)	2m 4s
make check on macOS (macos-14)	1m 14s
make check on Solaris 11 OmniOS	8m 46s
make check on Solaris 11	3m 46s
make check on macOS (macos-15)	5m 14s
make check on mingw	-1s
make check on FreeBSD	4m 50s
make check on NetBSD	4m 56s
make check with sanitizers	3m 6s
make check on MSVC	-1s
make check on Cygwin (32)	5m 56s
make check with the newest clang release	4m 18s
make check with a cross-compiler	1m 10s
	1h 12m 57s

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