tools/build: Support building with glibc 2.38

Ubuntu 23.10 uses glibc 2.38. This adds strlcpy and strlcmp so we need
to remove them from the cross build environment.

Reviewed by: jrtc27 (earlier version), arichardson
Sponsored by: Arm Ltd
Differential Revision: https://reviews.freebsd.org/D42303