cc-1506 cc: REMARK File = ../../curl/ares/ares__read_line.c, Line = 46
There is an implicit conversion from "unsigned long" to "int"; rounding, sign
extension, or loss of accuracy may result.

if (!fgets(*buf + offset, *bufsize - offset, fp))

configure stuff

and we can't depend on configure-defines in it. This logic is borrowed from
the public curl headers.

to warn

they may not be of the size size

pointer arithmetic (ptr1 - ptr2) and to do that properly on 64bit we need
long

on Windows.