Fix make dist for windows

Signed-off-by: falkTX <falktx@falktx.com>

Makefile.dist.mk

@@ -295,7 +295,7 @@ define GENERATE_LIBRARY_ZIP
 endef
 else ifeq ($(WIN32),true)
 define GENERATE_LIBRARY_ZIP
-	env PYTHONPATH=$(CURDIR)/source/frontend:$(QT5_PREFIX)/lib/python3/site-packages SCRIPT_NAME=${1} $(PYTHON) ./data/windows/app-gui.py build_exe
+	env PYTHONPATH="$(CURDIR)/source/frontend;$(QT5_PREFIX)/lib/python3/site-packages" SCRIPT_NAME=${1} $(PYTHON) ./data/windows/app-gui.py build_exe
 endef
 endif