Fix #311 (#316)

* Fix #311

Add check for sys.platform == 'cli' and set os to 'Windows'.

* Remove workaround

.travis.yml

@@ -18,12 +18,9 @@ dist: trusty
 
 osx_image: xcode9.1
 
-dotnet: 2.0.0
+dotnet: 2.1.4
 
 script:
-  # remove this workaround when https://bugzilla.xamarin.com/show_bug.cgi?id=60340 is fixed and released
-  - if [[ "$TRAVIS_OS_NAME" != "osx" ]] ; then (cd /usr/lib/mono/msbuild/15.0/bin/Roslyn ; sudo ln -s ../../../../4.5/csc.exe . ; sudo ln -s ../../../../4.5/csc.exe.config . ; sudo ln -s ../../../../4.5/csc.rsp .) ; fi
-  - if [[ "$TRAVIS_OS_NAME" == "osx" ]] ; then (cd /Library/Frameworks/Mono.framework/Versions/Current/lib/mono/msbuild/15.0/bin/Roslyn/ ; sudo ln -s ../../../../4.5/csc.exe . ; sudo ln -s ../../../../4.5/csc.exe.config . ; sudo ln -s ../../../../4.5/csc.rsp .) ; fi
   - dotnet restore IronPython.sln --packages ./packages
   - if [[ "$TRAVIS_OS_NAME" != "osx" ]] ; then make ; fi
   - if [[ "$TRAVIS_OS_NAME" != "osx" ]] ; then docker run -v /home/travis/build/IronLanguages/ironpython2:/home/travis/build/IronLanguages/ironpython2 mono:4.8 /bin/sh -c "apt-get update ; apt-get install make ; cd /home/travis/build/IronLanguages/ironpython2 && make test-all" ; fi

Src/StdLib/Lib/platform.py

@@ -1210,6 +1210,10 @@ def uname():
             if not version:
                 version = vendor
 
+        elif system == 'cli':
+            # we know this is Windows, because uname exists on Linux and macOS
+            system = 'Windows'
+
     # System specific extensions
     if system == 'OpenVMS':
         # OpenVMS seems to have release and version mixed up