fix dnd with pyinstaller

scripts/pyinstaller.run.bat

@@ -21,7 +21,7 @@
 
 @echo.
 @echo running-pyinstaller-stage_librer
-pyinstaller --version-file=version.pi.librer.txt --noconfirm --clean --add-data="distro.info.txt:." --add-data="version.txt;." --add-data="../LICENSE;." --icon=icon.ico --distpath=%OUTDIR% --windowed --contents-directory=internal librer.py  || exit /b 2
+pyinstaller --version-file=version.pi.librer.txt --noconfirm --clean --add-data="distro.info.txt:." --add-data="version.txt;." --add-data="../LICENSE;." --icon=icon.ico --distpath=%OUTDIR% --windowed --contents-directory=internal --additional-hooks-dir=. --collect-binaries tkinterdnd2 librer.py  || exit /b 2
 
 @echo.
 @echo running-pyinstaller-stage_record

scripts/pyinstaller.run.sh

@@ -21,7 +21,7 @@ echo pyinstaller `pyinstaller --version` >> distro.info.txt
 
 echo ''
 echo running-pyinstaller-stage_librer
-pyinstaller --strip --noconfirm --noconsole --clean --add-data="distro.info.txt:." --add-data="version.txt:." --add-data="../LICENSE:." --contents-directory=internal --distpath=$outdir ./librer.py
+pyinstaller --strip --noconfirm --noconsole --clean --add-data="distro.info.txt:." --add-data="version.txt:." --add-data="../LICENSE:." --contents-directory=internal --distpath=$outdir --additional-hooks-dir=. --collect-binaries tkinterdnd2 ./librer.py
 
 echo ''
 echo running-pyinstaller-stage_record

src/hook-tkinterdnd2.py

@@ -0,0 +1,12 @@
+"""pyinstaller hook file.
+
+You need to use this hook-file if you are packaging a project using tkinterdnd2.
+Just put hook-tkinterdnd2.py in the same directory where you call pyinstaller and type:
+
+    pyinstaller myproject/myproject.py --additional-hooks-dir=.
+"""
+
+from PyInstaller.utils.hooks import collect_data_files, eval_statement
+
+
+datas = collect_data_files('tkinterdnd2')