msvc: fix building with HAVE_INET_NTOP and MSVC <=1900

MSVC 1900 and older is missing a `const` specifier in the `inet_ntop()`
declaration for the second argument. A workaround was in place for it
in cmake, but it didn't cover all necessary versions.

Replace the workaround with a different one, move it to `lib/inet_ntop.c`
and extend to all necessary MSVC versions.

Also add CI jobs for the older MSVC versions: 2013, 2015, 2017.

Closes #15923

appveyor.yml

@@ -61,6 +61,39 @@ environment:
       ENABLE_UNICODE: 'OFF'
       SHARED: 'ON'
       EXAMPLES: 'ON'
+    - job_name: 'CMake, VS2013, Debug, x64, OpenSSL 1.1.1, Build-only'
+      APPVEYOR_BUILD_WORKER_IMAGE: 'Visual Studio 2015'
+      BUILD_SYSTEM: CMake
+      PRJ_GEN: 'Visual Studio 12 2013'
+      TARGET: '-A x64'
+      PRJ_CFG: Debug
+      OPENSSL: 'ON'
+      SCHANNEL: 'OFF'
+      ENABLE_UNICODE: 'OFF'
+      SHARED: 'ON'
+      TFLAGS: 'skipall'
+    - job_name: 'CMake, VS2015, Debug, x64, OpenSSL 1.1.1, Build-only'
+      APPVEYOR_BUILD_WORKER_IMAGE: 'Visual Studio 2015'
+      BUILD_SYSTEM: CMake
+      PRJ_GEN: 'Visual Studio 14 2015'
+      TARGET: '-A x64'
+      PRJ_CFG: Debug
+      OPENSSL: 'ON'
+      SCHANNEL: 'OFF'
+      ENABLE_UNICODE: 'OFF'
+      SHARED: 'ON'
+      TFLAGS: 'skipall'
+    - job_name: 'CMake, VS2017, Debug, x64, OpenSSL 1.1.1, Build-only'
+      APPVEYOR_BUILD_WORKER_IMAGE: 'Visual Studio 2017'
+      BUILD_SYSTEM: CMake
+      PRJ_GEN: 'Visual Studio 15 2017'
+      TARGET: '-A x64'
+      PRJ_CFG: Debug
+      OPENSSL: 'ON'
+      SCHANNEL: 'OFF'
+      ENABLE_UNICODE: 'OFF'
+      SHARED: 'ON'
+      TFLAGS: 'skipall'
     - job_name: 'CMake, VS2022, Release, x64, OpenSSL 3.3, Shared, Build-tests'
       APPVEYOR_BUILD_WORKER_IMAGE: 'Visual Studio 2022'
       BUILD_SYSTEM: CMake