cups: Fix incorrect `--without-gssapi` flag to be `--disable-gssapi` (#19816)
cups: Fix incorrect `--without-gssapi` flag to be `--disable-gssapi` (#19816)

* cups: Fix incorrect `--without-gssapi` flag to be `--disable-gssapi`

- We found the fix for this in
  https://github.com/Homebrew/linuxbrew-core/issues/19707#issuecomment-590585914,
  but it was patched incorrectly in
  https://github.com/Homebrew/linuxbrew-core/pull/19709 and I didn't
  notice.

Thanks to @greghogan for pointing this typo out.
Linuxbrew/homebrew-core,maxim-belkin/homebrew-core,Linuxbrew/homebrew-core,rwhogg/homebrew-core,maxim-belkin/homebrew-core,rwhogg/homebrew-core