Reorder pybind11 to be after we find the interp and libs ourselves

Our python find module is patched for vcpkg and we want it to execute first.

CMakeLists.txt

@@ -810,12 +810,6 @@ set( INC_AFTER
 find_package( SWIG 3.0 REQUIRED )
 include( ${SWIG_USE_FILE} )
 
-# pybind11 is header-only, so include the subdir
-add_subdirectory(thirdparty/pybind11)
-
-# Make sure that we get our pybind11 and not the system pybind11 (ours is patched to work with wx)
-include_directories( BEFORE SYSTEM ${PYBIND11_INCLUDE_DIR} )
-
 set( PythonInterp_FIND_VERSION 3.6 )
 set( PythonLibs_FIND_VERSION 3.6 )
 
@@ -857,6 +851,12 @@ message( STATUS "Python module install path: ${PYTHON_DEST}" )
 
 find_package( PythonLibs 3.6 REQUIRED )
 
+# pybind11 is header-only, so include the subdir
+add_subdirectory(thirdparty/pybind11)
+
+# Make sure that we get our pybind11 and not the system pybind11 (ours is patched to work with wx)
+include_directories( BEFORE SYSTEM ${PYBIND11_INCLUDE_DIR} )
+
 # Infrequently needed headers go at end of search paths, append to INC_AFTER which
 # although is used for all components, should be a harmless hit for something like eeschema
 # so long as unused search paths are at the end like this.