Follow-up to review-master-upstream-20249999-oa-dcff2f64-6535a4e1.md:
- strcpy_s: add an inline fallback implementation right after the declaration,
guarded by #ifndef __STDC_LIB_EXT1__. glibc never defines that macro and does
not provide the C11 Annex K interfaces, so the bare declaration was an
unresolved symbol at link time; the fallback makes magicOA.o self-contained
(strcpy_s becomes a defined symbol) while a real Annex K libc still wins.
- magicInit.cpp / magicOA.cpp: use `char argvbuf[] = "tclsh"` for the mutable
argv string instead of `char[32]` + snprintf.