This feels more like a band-aid solution - it still requires very manual
intervention to get the next builds, but at least this way we don't rely
on whatever Clang/libc++ happens to ship with FreeBSD for the only
libc++ testing. It seems like sanitizer builds don't use libc++, but I'd
rather a dedicated Linux/Clang/libc++ task at least.
The ccache version shipped with Ubuntu 24.04 does not yet recognize
--fprofile-update=atomic, install one that does.
Now that the asan_sanitizer build also includes building Spicy and
running the spicyz test suite, ccache is quite important.
Reference ccache/ccache#1408 and zeek/zeek#3777.
