Set 64-bit python on path ahead of 32-bit for CMake to grab the corre…

…ct one

appveyor.yml

@@ -5,18 +5,16 @@ os: Windows Server 2012
 platform:
   - x64
 
+init:
+  - SET PATH=C:\Python27-x64\;%PATH%
+
 configuration: Release
 
 environment:
   # set the directory to use for OSGeo4W install, our CMake find packages know
   # to look here
   OSGEODIR: C:\OSGeo4W64
 
-  # make sure we are using 64-bit python libs
-  PYTHON: "C:\\Python27-x64"
-  PYTHON_VERSION: "2.7.10"
-  PYTHON_ARCH: "64"
-
   matrix:
     - PDAL_OPTIONAL_COMPONENTS: OFF
     - PDAL_OPTIONAL_COMPONENTS: ON