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d76b76221f
config.h already has a hand-added _LIBIDN2_LP_DECLS guarded block at
the end declaring extern strverscmp for the same gnulib-overlay reason.
Move the strchrnul prototype into that block (still #ifdef __APPLE__
since glibc Linux already declares it) so all project-added externs
live in one place, the autoconf-generated section stays untouched, and
the precedent for "how this codebase handles missing glibc extensions"
is one consistent pattern instead of two.
Refresh the build.zig and strchrnul.c comments to point at the
relocated declaration.
No functional change — verified across -target x86_64-macos.{13.0,
14.0,15.4} (lookup.c pattern + the three TUs that include both
<config.h> and <string.h>) plus x86_64-linux-gnu, all under
-Wall -Wextra -Werror.