So only expose these in generic-glibc/string.h if Zig is building
a v2.38 (or later) glibc stub.
Announcement of 2.38 that notes strlcpy and strlcat:
https://lists.gnu.org/archive/html/info-gnu/2023-07/msg00010.html
4a5d73a34dPat Tullmann committed on 1/5/2024, 12:12:07 AM· committed by Andrew Kelleyparentc22d1c0