Bytecode in Paths.pyc file is stale after the installation

Describe the bug
When installing zenmap, one of the resulting bytecode .pyc files (Paths.pyc) is not importable because Paths.py file is updated in function fix_paths here after it was already compiled.

To Reproduce
Run python2 setup.py install --prefix ./proto in the zenmap directory. Resulting ./proto/lib/python2.7/site-packages/zenmapCore/Paths.pyc file will be stale as the corresponding Paths.py has a newer timestamp.

Expected behavior
Paths.pyc file is not stale.

Possible fix
I fixed this by adding py_compile.compile() right after the file is written and that fixes this issue; however, I am not sure whether that is the best way to fix this (the fix_paths should probably be called before the initial compilation begins avoiding this issue).

--- nmap-7.80/zenmap/setup.py
+++ nmap-7.80/zenmap/setup.py
@@ -437,6 +437,9 @@ for dir in dirs:
         pf.write(pcontent)
         pf.close()
 
+        import py_compile
+        py_compile.compile(paths_file)
+
         # Rewrite the zenmap.desktop and zenmap-root.desktop files to point to
         # the installed locations of the su-to-zenmap.sh script and application
         # icon.

Start in zenmap/setup.py, reading fix_paths and the installation loop around the Paths.py rewrite. Reproduce with python2 setup.py install --prefix ./proto in zenmap, then verify that proto/lib/python2.7/site-packages/zenmapCore/Paths.pyc is importable and is not older than Paths.py.