Set required environment variables in evergreen.yml.

Author: rstam

evergreen/evergreen.yml

@@ -8,11 +8,12 @@ tasks:
     params:
       working_dir: mongo-csharp-driver
       script: |
-        powershell.exe .\\build.ps1 -target BuildNet45
+        for var in TMP TEMP NUGET_PACKAGES NUGET_HTTP_CACHE_PATH APPDATA; do setx $var z:\\data\\tmp; export $var=z:\\data\\tmp; done
+        powershell.exe .\\build.ps1 -target Build
 
 buildvariants:
 - name: windows-64-compile
   display_name: windows-64-compile
   run_on: windows-64-vs2015-small
   tasks:
-  - name: compile
+  - name: compile