appveyor.yml: Compile and test with latest version for __cplusplus macro on MSVC

According to [1] the C++ macro __cplusplus has always the value 199711L even if you enable later version of C++ support via /std. Use one job with /Zc:__cplusplus defined so that we know that it compiles. [1]: https://docs.microsoft.com/en-us/cpp/build/reference/zc-cplusplus?view=vs-2019

appveyor.yml: Compile and test with latest version for __cplusplus macro on MSVC
5607dfb4 · Thomas Braun · 6a53a95c · 5607dfb4
Commit 5607dfb4 authored Oct 23, 2019 by Thomas Braun
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--- a/appveyor.yml
+++ b/appveyor.yml
@@ -85,7 +85,7 @@ environment:
    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
      configuration: Release
      platform: x64
-      CXX_FLAGS: "/permissive- /std:c++latest /utf-8 /F4000000"
+      CXX_FLAGS: "/permissive- /std:c++latest /Zc:__cplusplus /utf-8 /F4000000"
      LINKER_FLAGS: "/STACK:4000000"
      GENERATOR: Visual Studio 15 2017