HAVE_POLKIT seems unused
## Version information
4.19.3
I'm packaging it for Gentoo
## Steps to reproduce
`grep -R HAVE_POLKIT`
## Current behavior
I've noticed that thunar 4.19.3 adds a check for optional polkit package. However, it doesn't seem that the result of the check is actually used anywhere. FWICS, the only mention of `HAVE_POLKIT` in Makefiles (and source code) is:
```
# Not using HAVE_POLKIT because a lot of distributions put
# polkit.{its,loc} in binary package instead of development package.
# E.g. Debian puts in polkitd instead of libpolkit-gobject-1-dev
```
## Expected outcome
I'd like to ask for clarification whether having polkit or not actually changes anything at build time.
issue