Fix flake8 warnings, suppress warnings that would break quoting

build-aux/meson/postinstall.py

@@ -10,7 +10,8 @@ destdir = environ.get('DESTDIR', '')
 # Package managers set this so we don't need to run
 if not destdir:
     print('Updating icon cache...')
-    call(['gtk-update-icon-cache', '-qtf', path.join(datadir, 'icons', 'hicolor')])
+    call(['gtk-update-icon-cache', '-qtf',
+          path.join(datadir, 'icons', 'hicolor')])
 
     print('Updating desktop database...')
     call(['update-desktop-database', '-q', path.join(datadir, 'applications')])