fix building process on Windows

Author: xendke

setup.py

@@ -1,5 +1,6 @@
 """ File used by cx_freeze to package python application. """
 import sys
+import os
 from cx_Freeze import setup, Executable
 
 additional_mods = ['numpy.core._methods', 'numpy.lib.format']
@@ -8,6 +9,15 @@
 base = None
 if sys.platform == "win32":
     base = "Win32GUI"
+    # building on Windows: copy tcl and tk to the build
+    PYTHON_INSTALL_DIR = os.path.dirname(os.path.dirname(os.__file__))
+    os.environ['TCL_LIBRARY'] = os.path.join(PYTHON_INSTALL_DIR, 'tcl', 'tcl8.6')
+    os.environ['TK_LIBRARY'] = os.path.join(PYTHON_INSTALL_DIR, 'tcl', 'tk8.6')
+    include_files.extend([
+            os.path.join(PYTHON_INSTALL_DIR, 'DLLs', 'tk86t.dll'),
+            os.path.join(PYTHON_INSTALL_DIR, 'DLLs', 'tcl86t.dll'),
+         ])
+
 
 setup(
     name="Digitaizer",