TSK now requires NuGet to be installed and packages to be restored.

appveyor.yml

@@ -23,6 +23,7 @@ environment:
       PYTHON: "C:\\Python36-x64"
 
 install:
+  - ps: choco install nuget.commandline
   - ps: choco install ant --ignore-dependencies
   - git clone https://github.com/sleuthkit/sleuthkit
   - ps: $env:Path="C:\Program Files\Java\jdk1.8.0\bin;$($env:Path);C:\ProgramData\chocolatey\lib\ant"
@@ -36,6 +37,7 @@ services:
 
 build_script:
   - cd %TSK_HOME%
+  - nuget restore win32\libtsk -PackagesDirectory win32\packages
   - python setupDevRepos.py
   - python win32\updateAndBuildAll.py -m
   - ps: pushd bindings/java