Remove shell quoting from notmuch-show--build-buffer.  The args list
is ultimately passed to call-process, which passes them verbatim to
the subprocess (typically, notmuch).  The quoting, intended for a
shell, is unnecessary and confusing.

This code originally appeared in
9193455fa1476ea3957475e77379b75efa6dd90b, aiming to support remote
notmuch execution over ssh.  The commit message included this example
shell script (simplified):

  #!/bin/sh
  ssh remotehost notmuch $@

That script doesn't properly quote "$@".  Even if it did, it wouldn't
work because the shell ssh starts on the remote host does another
round of shell word splitting.  Fortunately, notmuch already provides
an example of a correct shell script on
https://notmuchmail.org/remoteusage/ (again simplified):

  #!/bin/bash
  printf -v ARGS "%q " "$@"
  ssh remotehost notmuch $ARGS

With the above script I'm able to use notmuch in "remote" mode.
Quoted search terms work as expected, etc.

---
 emacs/notmuch-show.el | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/emacs/notmuch-show.el b/emacs/notmuch-show.el
index 5a585f3..da2d685 100644
--- a/emacs/notmuch-show.el
+++ b/emacs/notmuch-show.el
@@ -1267,9 +1267,9 @@ first relevant message.
 If no messages match the query return NIL."
   (let* ((basic-args (list notmuch-show-thread-id))
         (args (if notmuch-show-query-context
-                  (append (list "\'") basic-args
-                          (list "and (" notmuch-show-query-context ")\'"))
-                (append (list "\'") basic-args (list "\'"))))
+                  (append basic-args
+                          (list "and (" notmuch-show-query-context ")"))
+                basic-args))
         (cli-args (cons "--exclude=false"
                         (when notmuch-show-elide-non-matching-messages
                           (list "--entire-thread=false"))))
-- 
tg: (89c8d27..) t/remote-quoting (depends on: master)
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