AppVeyor: Add some verbose information the Go directory in PATH

Since we were having issues with this in the past, see e.g. [1], add
some verbose information to ease debugging in the future.

[1] appveyor/ci#1342

Author: sschuberth

appveyor.yml

@@ -11,6 +11,15 @@ install:
   - cinst golang --version 1.8.0 -y
   - cinst InnoSetup -y
   - refreshenv
+  - ps: |
+      echo "Go directories in machine PATH environment:"
+      [environment]::GetEnvironmentVariable("PATH","Machine").split(";") | Select-String -Pattern "\\go\\"
+      echo "Go directories in user PATH environment:"
+      [environment]::GetEnvironmentVariable("PATH","User").split(";") | Select-String -Pattern "\\go\\"
+      echo "Go directories in process PATH environment:"
+      [environment]::GetEnvironmentVariable("PATH","Process").split(";") | Select-String -Pattern "\\go\\"
+      echo "Go version information:"
+      go version
 
 build_script:
   - bash --login -c 'GOARCH=386 script/bootstrap'