try forcing ninja as generator for windows

Author: hobu

scripts/azp/win.yml

@@ -22,15 +22,13 @@ jobs:
         ECHO ON
         call activate pdal
         call conda config --set always_yes True --set show_channel_urls True
-        call conda install --yes --quiet --name pdal -c conda-forge  compilers  ninja pdal pytest -y
+        call conda install --yes --quiet --name pdal -c conda-forge scikit-build compilers  ninja pdal pytest -y
       displayName: Install PDAL
     - script: |
         ECHO ON
         call activate pdal
-        echo %VSINSTALLDIR%
-        echo %PATH%
-        set VCTargetsPath="C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160"
-        pip install -e .
+        pip install -e .  --install-option="-DCMAKE_GENERATOR=Ninja"
+        # --install-option="-DPdal_DIR=%CONDA_PREFIX%\Library\lib\cmake\PDAL"
       displayName: 'Build'
     - script: |
         call activate pdal