Bugfixes:
* Do not adns_cancel in the middle of adns_forallqueries.
+ * strlen returns size_t, not int; fixed up everywhere relevant.
+ Closes #393970. (Bug exists only where int and ssize_t differ.)
+
+ Portability fixes:
+ * Remove unecessary assertion of val<=0xffffffffUL where uint32_t val;
+ Closes: #394039 (FTBFS due to unhelpful GCC warning).
+
+ Internal improvements:
+ * Add a few assertions about *_LLEN in adns.c.
+ * Comprehensive review of use of `int' and defense against overflow.
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