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cares: Support malloc(0) scenarios for AIX

Rodrigo Muino Tomonari requested to merge github/fork/gireeshpunathil/malloczerosupport into master
Checklist
  • tests and code linting passes
  • a test and/or benchmark is included
  • documentation is changed or added
  • the commit message follows commit guidelines
Affected core subsystem(s)
Description of change

Many places in cares library, when the stream data arrives from the network with respect to dns and reverse dns resolution, they are populated into data structures created dymaically based on the size of the data. Malloc is heavily used for such cases.

Often, based on the data length, malloc(0) is invoked. Linux behavior on zero byte allocation is to return a valid pointer where in AIX, it always return NULL.

This manifestst as test failure of test/internet/test-dns.js

Solution is to build cares with Linux compatible malloc behavior

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