Set python path to build pdal-python

SuperBuild/cmake/External-PDALPython.cmake

@@ -1,6 +1,11 @@
 set(_proj_name pdal-python)
 set(_SB_BINARY_DIR "${SB_BINARY_DIR}/${_proj_name}")
 
+if (WIN32)
+  set(PP_EXTRA_ARGS -DPYTHON3_EXECUTABLE=${PYTHON_EXE_PATH}
+                    -DPython3_NumPy_INCLUDE_DIRS=${PYTHON_HOME}/lib/site-packages/numpy/core/include)
+endif()
+
 ExternalProject_Add(${_proj_name}
   DEPENDS           pdal
   PREFIX            ${_SB_BINARY_DIR}
@@ -19,6 +24,7 @@ ExternalProject_Add(${_proj_name}
     -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}
     -DCMAKE_INSTALL_PREFIX:PATH=${SB_INSTALL_DIR}/lib/python3.8/dist-packages
     ${WIN32_CMAKE_ARGS}
+    ${PP_EXTRA_ARGS}
   #--Build step-----------------
   BINARY_DIR        ${_SB_BINARY_DIR}
   #--Install step---------------