When glibc was bumped to version 2.39 in commit
b5680f53d6 it removed the deprecated
libcrypt support.
But compiler-rt package still use crypt.h header and crypt() function
in the sanitizer code.
Use libxcrypt unconditionally since compiler-rt itself already depends
on glibc based toolchain.
Fixes:
https://gitlab.com/buildroot.org/buildroot/-/jobs/6703222513
Signed-off-by: Romain Naour <romain.naour@smile.fr>