AVRO-2955: Avro-C: Support all Visual Studio versions from 2010 to 2019

[kiyolee]

AVRO-2955: Avro-C: Support all Visual Studio versions from 2010 to 2019

Fix compiling using Visual Studio 2010|2013|2015|2017|2019.
Fix building using either cmake/ninja or cmake/visualstudio.
Fix testing using cmake/ninja.
Improve Windows compatibility.
All existing tests passed using all Visual Studio versions mentioned.

Make sure you have checked all steps below.

Jira

• My PR addresses the following Avro Jira issues and references them in the PR title. For example, "AVRO-1234: My Avro PR"
  • https://issues.apache.org/jira/browse/AVRO-2955
  • In case you are adding a dependency, check if the license complies with the ASF 3rd Party License Policy.
    *** Imported a couple of files (getopt.h/getopt_long.c) from FreeBSD with modification for Windows. BSD licensed sources should be compatible with the license here.

Tests

• My PR adds the following unit tests OR does not need testing for this extremely good reason:
  *** No new functionality added. All existing tests passed.

Commits

• My commits all reference Jira issues in their subject lines. In addition, my commits follow the guidelines from "How to write a good git commit message":
  1. Subject is separated from body by a blank line
  2. Subject is limited to 50 characters (not including Jira issue reference)
  3. Subject does not end with a period
  4. Subject uses the imperative mood ("add", not "adding")
  5. Body wraps at 72 characters
  6. Body explains "what" and "why", not "how"

Documentation

• In case of new functionality, my PR adds documentation that describes how to use it.
  • All the public functions and the classes in the PR contain Javadoc that explain what it does
    *** No new functionality added.