Revert "DEV: coccinelle: Add rule to use `chunk_istcat()` instead of `chunk_strncat()`"

This reverts commit b9656e48377a9e5359494bce6a413a9915c8f74b. It's
not needed anymore since 49b0482ed ("CLEANUP: chunk: remove misleading
chunk_strncat() function").
1 file changed