fix(cmake): support Windows ARM cross-compilation

Author: henryiii

tools/FindPythonLibsNew.cmake

@@ -268,13 +268,15 @@ mark_as_advanced(PYTHON_LIBRARY PYTHON_INCLUDE_DIR)
 # library. We now set the variables listed by the documentation for this
 # module.
 set(PYTHON_INCLUDE_DIRS "${PYTHON_INCLUDE_DIR}")
-set(PYTHON_LIBRARIES "${PYTHON_LIBRARY}")
+if(NOT DEFINED PYTHON_LIBRARIES)
+    set(PYTHON_LIBRARIES "${PYTHON_LIBRARY}")
+endif()
 if(NOT PYTHON_DEBUG_LIBRARY)
   set(PYTHON_DEBUG_LIBRARY "")
 endif()
 set(PYTHON_DEBUG_LIBRARIES "${PYTHON_DEBUG_LIBRARY}")
 
-find_package_message(PYTHON "Found PythonLibs: ${PYTHON_LIBRARY}"
+find_package_message(PYTHON "Found PythonLibs: ${PYTHON_LIBRARIES}"
                      "${PYTHON_EXECUTABLE}${PYTHON_VERSION_STRING}")
 
 set(PYTHONLIBS_FOUND TRUE)