MNT: constant string arrays instead of pointers in C #29042
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Trying to avoid this compiler warning:
../numpy/_core/src/multiarray/stringdtype/casts.cpp:860:12: warning: 'char* strncat(char*, const char*, size_t)' specified bound 15 equals source length [-Wstringop-overflow=]
860 | strncat(buf, suffix, slen);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~
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Backport of #28985.
See for example: