[build appveyor] add msbuild logs as artifacts

appveyor.yml

@@ -13,6 +13,14 @@ shallow_clone: true
 install:
   - scripts\build-appveyor.bat
 
+artifacts:
+  - path: mapnik-gyp\msbuild-summary.txt
+    name: msbuild-summary.txt
+  - path: mapnik-gyp\msbuild-errors.txt
+    name: msbuild-errors.txt
+  - path: mapnik-gyp\msbuild-warnings.txt
+    name: msbuild-warnings.txt
+
 build: off
 test: off
 deploy: off

scripts/build-appveyor.bat

@@ -21,6 +21,8 @@ ECHO msvs_toolset^: %msvs_toolset%
 SET BUILD_TYPE=%configuration%
 SET BUILDPLATFORM=%platform%
 SET TOOLS_VERSION=%msvs_toolset%.0
+IF DEFINED APPVEYOR (ECHO on AppVeyor) ELSE (ECHO NOT on AppVeyor)
+ECHO ========
 
 SET PATH=C:\Python27;%PATH%
 SET PATH=C:\Program Files\7-Zip;%PATH%