Remove tzdata from sysroot content?

[h-vetinari]

A large part of the content of sysroot_linux-<arch> is effectively the same as what's in tzdata, only shifted under

$PREFIX/<arch>-conda-linux-gnu/sysroot/usr/share/zoneinfo

instead of under $PREFIX/share/zoneinfo.

Without having done a manual diff (because I'm assuming the sysroots get out of date, while the tzdb keeps getting updated), the one noticeable difference I see is that the sysroot also contains yet more copies (variants?) of the tzdb under

$PREFIX/<arch>-conda-linux-gnu/sysroot/usr/share/zoneinfo/posix/...
$PREFIX/<arch>-conda-linux-gnu/sysroot/usr/share/zoneinfo/right/...

Perhaps it's a hassle to change or more convenient to keep the tzdb in the sysroot, but it seems like an odd duplication to me.