Merge pull request #2132 from peastman/appveyor

Attempt at fixing AppVeyor (again...)

appveyor.yml

@@ -30,6 +30,7 @@ install:
   - choco install -y doxygen.portable swig > null
 
 # Download OpenCL Headers and build the ICD loader
+  - ps: "[System.Net.ServicePointManager]::SecurityProtocol = [System.Net.SecurityProtocolType]::Tls12;"
   - ps: $opencl_registry = "https://www.khronos.org/registry/cl"
   - ps: $opencl_github = "KhronosGroup/OpenCL-Headers"
   - ps: mkdir C:/opencl > $null
@@ -39,7 +40,7 @@ install:
   - ps: 7z x opencl-icd-1.2.11.0.tar > $null
   - ps: mv .\icd\* .
   - ps: mkdir inc/CL > $null
-  - ps: wget https://github.com/$opencl_github/tree/master/CL | select -ExpandProperty links | where {$_.href -like "*.h*"} | select -ExpandProperty outerText | foreach{ wget https://raw.githubusercontent.com/$opencl_github/master/CL/$_ -OutFile inc/CL/$_ }
+  - ps: wget https://github.com/$opencl_github/tree/master/CL -UseBasicParsing | select -ExpandProperty links | where {$_.href -like "*.h*"} | select -ExpandProperty title | foreach{ wget https://raw.githubusercontent.com/$opencl_github/master/CL/$_ -OutFile inc/CL/$_ -UseBasicParsing}
   - ps: mkdir lib > $null
   - ps: cd lib
   - cmake -G "NMake Makefiles" ..