Hi there,

the test suite started to fail on EPEL 8 with the new tree-outline-mode:
```
EMACS emacs/notmuch-tree.elc

In notmuch-tree-mode:
emacs/notmuch-tree.el:1088:9:Warning: reference to free variable
    `notmuch-tree-outline-enabled'

In notmuch-tree-outline--set-visibility:
emacs/notmuch-tree.el:1322:14:Warning: reference to free variable
    `notmuch-tree-outline-mode'
emacs/notmuch-tree.el:1415:20:Error: Wrong number of arguments: (2 . 2), 4
make: *** [emacs/Makefile.local:87: emacs/notmuch-tree.elc] Error 1
```
Does the implementation require a specific emacs version?
EPEL 8 has emacs 26.1.

I am not going to update official notmuch packages for EPEL 8 anyways,
but others might care about older emacs. (I do provide notmuch-git
test packages for EPEL 8 so far.)

Cheers
Michael
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