Add following interceptors on Linux: stat, lstat, fstat, fstatat.
This fixes use-of-uninitialized value on platforms with GLIBC 2.33+.
In particular: Arch Linux, Ubuntu hirsute/impish.
The tests should have also been failing during the release on the mentioned platforms, but I cannot find any related discussion.
Most likely, the regression was introduced by glibc commit 8ed005daf0ab03e14250032:
all stat-family functions are now exported as shared functions.
Before, some of them (namely stat, lstat, fstat, fstatat) were provided as a part of libc_noshared.a and called their __xstat dopplegangers. This is still true for Debian Sid and earlier Ubuntu's. stat interceptors may be safely provided for them, no problem with that.