set comment for file in zip (obsolete interface)
index, const char
zip_set_file_comment() function is the obsolete version of zip_file_set_comment(3). The only differences are the type of the len argument and the additional flags argument.
zip_set_file_comment() is the same as calling zip_file_set_comment(3) with an empty flags argument.
zip_set_file_comment() was added in libzip 0.7. In libzip 0.10 the type of index was changed from int to zip_uint64_t. It was deprecated in libzip 0.11, use