[PATCH] ping: Add availability test.

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=46620

Your paranoid android.


=== build (build log) ===

collect2: error: ld returned 1 exit status
Makefile:220: recipe for target 'ping.exe_test.exe' failed
Makefile:7512: recipe for target 'programs/ping/tests' failed
Task: The exe32 Wine crossbuild failed

=== debian9 (build log) ===

collect2: error: ld returned 1 exit status
collect2: error: ld returned 1 exit status
Makefile:223: recipe for target 'ping.exe_test-stripped.exe.so' failed
Makefile:220: recipe for target 'ping.exe_test.exe.so' failed
Makefile:8651: recipe for target 'programs/ping/tests' failed
Task: The win32 build failed

=== debian9 (build log) ===

collect2: error: ld returned 1 exit status
Makefile:223: recipe for target 'ping.exe_test-stripped.exe.so' failed
collect2: error: ld returned 1 exit status
Makefile:220: recipe for target 'ping.exe_test.exe.so' failed
Makefile:8374: recipe for target 'programs/ping/tests' failed
Task: The wow64 build failed