ox: Fix async export with native compilation

* lisp/ox-beamer.el (org-beamer-export-to-pdf):
* lisp/ox-icalendar.el (org-icalendar-export-to-ics):
* lisp/ox-koma-letter.el (org-koma-letter-export-to-pdf):
* lisp/ox-man.el (org-man-export-to-pdf):
* lisp/ox-texinfo.el (org-texinfo-export-to-info): Quote lambda.

Quote or name lambdas to prevent their compilation into anonymous
functions which cannot be passed to the external async emacs process.

lisp/ox-beamer.el

@@ -1059,7 +1059,7 @@ Return PDF file's name."
   (let ((file (org-export-output-file-name ".tex" subtreep)))
     (org-export-to-file 'beamer file
       async subtreep visible-only body-only ext-plist
-      (lambda (file) (org-latex-compile file)))))
+      #'org-latex-compile)))
 
 ;;;###autoload
 (defun org-beamer-select-environment ()

lisp/ox-icalendar.el

@@ -888,8 +888,8 @@ Return ICS file name."
     (org-export-to-file 'icalendar outfile
       async subtreep visible-only body-only
       '(:ascii-charset utf-8 :ascii-links-to-notes nil)
-      (lambda (file)
-	(run-hook-with-args 'org-icalendar-after-save-hook file) nil))))
+      '(lambda (file)
+	 (run-hook-with-args 'org-icalendar-after-save-hook file) nil))))
 
 ;;;###autoload
 (defun org-icalendar-export-agenda-files (&optional async)

lisp/ox-koma-letter.el

@@ -982,7 +982,7 @@ Return PDF file's name."
         (org-koma-letter-special-contents))
     (org-export-to-file 'koma-letter file
       async subtreep visible-only body-only ext-plist
-      (lambda (file) (org-latex-compile file)))))
+      #'org-latex-compile)))
 
 
 (provide 'ox-koma-letter)

lisp/ox-man.el

@@ -1117,7 +1117,7 @@ Return PDF file's name."
   (let ((outfile (org-export-output-file-name ".man" subtreep)))
     (org-export-to-file 'man outfile
       async subtreep visible-only body-only ext-plist
-      (lambda (file) (org-latex-compile file)))))
+      #'org-latex-compile)))
 
 (defun org-man-compile (file)
   "Compile a Groff file.

lisp/ox-texinfo.el

@@ -1701,7 +1701,7 @@ Return INFO file's name."
 	(org-export-coding-system org-texinfo-coding-system))
     (org-export-to-file 'texinfo outfile
       async subtreep visible-only body-only ext-plist
-      (lambda (file) (org-texinfo-compile file)))))
+      #'org-texinfo-compile)))
 
 ;;;###autoload
 (defun org-texinfo-publish-to-texinfo (plist filename pub-dir)