vim: Import v8.1.0366

* 8.1.0366: pieces of the xdiff code are not used
* 8.1.0365: function profile doesn't specify where it was defined
* 8.1.0364: compiler warning in xdiff code
* 8.1.0363: internal diff isn't used by default as advertised
* 8.1.0362: cannot get the script line number when executing a function
* 8.1.0361: remote user not used for completion
* 8.1.0360: using an external diff program is slow and inflexible
* Update runtime files.

gitlog.txt

@@ -1 +1 @@
-* [8.1.0359](https://github.com/vim/vim/releases/tag/v8.1.0359): no clue what test failed when using a screendump twice\n* [8.1.0358](https://github.com/vim/vim/releases/tag/v8.1.0358): crash when using term_dumpwrite() after the job finished\n* [8.1.0357](https://github.com/vim/vim/releases/tag/v8.1.0357): instructions for tests are outdated\n* [8.1.0356](https://github.com/vim/vim/releases/tag/v8.1.0356): using :s with 'incsearch' prevents CTRL-R CTRL-W\n* [8.1.0355](https://github.com/vim/vim/releases/tag/v8.1.0355): incorrect adjusting the popup menu for the preview window
+* [8.1.0366](https://github.com/vim/vim/releases/tag/v8.1.0366): pieces of the xdiff code are not used\n* [8.1.0365](https://github.com/vim/vim/releases/tag/v8.1.0365): function profile doesn't specify where it was defined\n* [8.1.0364](https://github.com/vim/vim/releases/tag/v8.1.0364): compiler warning in xdiff code\n* [8.1.0363](https://github.com/vim/vim/releases/tag/v8.1.0363): internal diff isn't used by default as advertised\n* [8.1.0362](https://github.com/vim/vim/releases/tag/v8.1.0362): cannot get the script line number when executing a function\n* [8.1.0361](https://github.com/vim/vim/releases/tag/v8.1.0361): remote user not used for completion\n* [8.1.0360](https://github.com/vim/vim/releases/tag/v8.1.0360): using an external diff program is slow and inflexible\n* Update runtime files.