Log Message:
mu: update to 1.12.5

Packaging changes:
Removed patches that explicitly add in sys/wait.h since upstream has
fixed this bug on their end.

Upstream changes:
1.12.4 -> 1.12.5:
- Rework message composition; split off parts into mu4e-draft.el
  This tries harder to maintain the current buffer as expected
  This fixes e.g. emacs-report-bug handling
- New hook mu4e-compose-post-hook for tweaking what mu4e does when
  we're done with a message (after sending, cancelling, ...).
  By default, it tries to close the frame if needed, and restore
  the window configuration. See its docstring.
- Better handle forwarding of encoded messages
- Don't remove non-mu4e completion in composer
- Integrate iCalendar support with message-composition
- Handle mu4e-sent-messages-behavior correctly when it's a function
- Better support NetBSD
- Support some file systems that don't put the file type in d_type
- Improve documentation

1.12.3 -> 1.12.4:
- query when quitting emacs with unhandled marks in a headers buffer
- fix mime-handling
- update sent handling (simplifying it)
- some internal improvements
- number of small fixes / updates
- documentation updates
- re-enable a specific database lock; this makes indexing a bit
  slower, but hopefully avoids some db corruption.