Added temp iss file to gitignore, and fiex a bug in windows make

.gitignore

@@ -5,6 +5,7 @@
 /deploy/
 *.spec
 *.egg-info
+setup.iss
 
 # Documentation
 /docs/build/

make_windows.py

@@ -14,7 +14,6 @@ install all dependencies needed for runing the build, and for running
 novelWriter itself.
 """
 
-import nw
 import os
 import sys
 import getopt
@@ -177,6 +176,7 @@ if makeSetup:
     with open(os.path.join("setup", "win_setup.iss"), mode="r") as inFile:
         issData = inFile.read()
 
+    import nw # noqa: E402
     issData = issData.replace(r"%%version%%", nw.__version__)
     issData = issData.replace(r"%%dir%%", os.getcwd())