Fix Windows v2.8.0 C++11 and cppunit builds

[jimklimov]

Closes: #1594

UPDATE:
Closes: #1598
Closes: #1603

[AppVeyorBot]

✅ Build nut 2.8.0.5-Windows-v2.8.0-1 completed (commit d8dafa2ff0 by @jimklimov)

[AppVeyorBot]

❌ Build nut 2.8.0.7-Windows-v2.8.0-1 failed (commit ee71649393 by @jimklimov)

[jimklimov]

Sort of viable - builds, but needs more love for connections to actually work (missed something to port from upsclient.c? mixup of int and SOCKET struck after all? like #1592):

================================
[INFO] Call libnutclient test suite: cppnit with login credentials: simple admin
D: Getting test suite...
D: Preparing test runner...
D: Setting test runner outputter...
D: Launching the test run...
.[D] C++ NUT Client lib test running against Data Server at: localhost:34992
E.[D] Could not device list: Error while writing on socket
E.[D] Could not authenticate as a simple user: Error while writing on socket
[D] Could not log into primary device (envvars not set?) so test below should return empty client lists: Not connected
[D] Could not device client list: Not connected
E.[D] Could not authenticate as a simple user: Error while writing on socket
[D] Failed to set device variable: Not connected
E.[D] SKIPPING test_auth_primary()
##Failure Location unknown## : Error
Test name: nut::NutActiveClientTest::test_query_ver
uncaught exception of type std::exception (or derived).
- Error while writing on socket
##Failure Location unknown## : Error
Test name: nut::NutActiveClientTest::test_list_ups
uncaught exception of type std::exception (or derived).
- Not connected
##Failure Location unknown## : Error
Test name: nut::NutActiveClientTest::test_list_ups_clients
uncaught exception of type std::exception (or derived).
- Not connected
##Failure Location unknown## : Error
Test name: nut::NutActiveClientTest::test_auth_user
uncaught exception of type std::exception (or derived).
- Not connected
Failures !!!
Run: 5   Failure total: 4   Failures: 0   Errors: 4
D: Got to the end of test suite with code 'false'
[ERROR] cppnit complained, check above
[INFO] Stopping test daemons

[AppVeyorBot]

✅ Build nut 2.8.0.9-Windows-v2.8.0-1 completed (commit a51106a1b8 by @jimklimov)

[jimklimov]

Now it connects and passes, one more checkbox off our backs :)

[AppVeyorBot]

✅ Build nut 2.8.0.10-Windows-v2.8.0-1 completed (commit 1b3e8b5eb5 by @jimklimov)

[AppVeyorBot]

✅ Build nut 2.8.0.11-Windows-v2.8.0-1 completed (commit c580620323 by @jimklimov)

[AppVeyorBot]

✅ Build nut 2.8.0.12-Windows-v2.8.0-1 completed (commit 8c309e4cb3 by @jimklimov)

[AppVeyorBot]

✅ Build nut 2.8.0.13-Windows-v2.8.0-1 completed (commit f7b0588674 by @jimklimov)

[AppVeyorBot]

✅ Build nut 2.8.0.14-Windows-v2.8.0-1 completed (commit ae8ecbba31 by @jimklimov)

[AppVeyorBot]

❌ Build nut 2.8.0.15-Windows-v2.8.0-1 failed (commit 51e6e3d3fd by @jimklimov)

[AppVeyorBot]

✅ Build nut 2.8.0.16-Windows-v2.8.0-1 completed (commit dd0b65ab32 by @jimklimov)

[AppVeyorBot]

✅ Build nut 2.8.0.18-Windows-v2.8.0-1 completed (commit 2fa90e5f27 by @jimklimov)