Fixing AppVeyor

[jchodera]

AppVeyor is failing with:

powershell .\\devtools\\appveyor\\missing-headers.ps1
Downloading remedial  stdint.h  from http://msinttypes.googlecode.com/svn/trunk/stdint.h to C:\Program Files\Microsoft SDKs\Windows\v7.0\Include\stdint.h 
Exception calling "DownloadFile" with "2" argument(s): "The remote server 
returned an error: (404) Not Found."
At C:\projects\conda-recipes\devtools\appveyor\missing-headers.ps1:42 char:12
+            $webclient.DownloadFile($url, $filepath)
+            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : WebException

Downloading remedial  inttypes.h  from http://msinttypes.googlecode.com/svn/trunk/inttypes.h to C:\Program Files\Microsoft SDKs\Windows\v7.0\Include\inttypes.h 
Exception calling "DownloadFile" with "2" argument(s): "The remote server 
returned an error: (404) Not Found."
At C:\projects\conda-recipes\devtools\appveyor\missing-headers.ps1:42 char:12
+            $webclient.DownloadFile($url, $filepath)
+            ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
    + FullyQualifiedErrorId : WebException

because googlecode.com is no more (as @rmcgibbo observed).

Looks like someone has put this on GitHub:
https://github.com/chemeris/msinttypes

Anyone want to take a stab at fixing this?

[jchodera]

Addressed by #524