emacs-29 1e6a7594361: Fix building of VC package manuals with relative includes

[Philip Kaludercic]

branch: emacs-29
commit 1e6a7594361fa4d60c0d73450e45475593d93696
Author: Joseph Turner <joseph@breatheoutbreathe.in>
Commit: Philip Kaludercic <philipk@posteo.net>

    Fix building of VC package manuals with relative includes
    
    * lisp/emacs-lisp/package-vc.el (package-vc--build-documentation):
    Invoke makeinfo with -I to ensure the package directory is always
    consulted for @include statements.  (Bug#63337)
---
 lisp/emacs-lisp/package-vc.el | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lisp/emacs-lisp/package-vc.el b/lisp/emacs-lisp/package-vc.el
index 85193dd7a30..1fcc30595da 100644
--- a/lisp/emacs-lisp/package-vc.el
+++ b/lisp/emacs-lisp/package-vc.el
@@ -347,6 +347,7 @@ FILE can be an Org file, indicated by its \".org\" 
extension,
 otherwise it's assumed to be an Info file."
   (let* ((pkg-name (package-desc-name pkg-desc))
          (default-directory (package-desc-dir pkg-desc))
+         (docs-directory (expand-file-name (file-name-directory file)))
          (output (expand-file-name (format "%s.info" pkg-name)))
          clean-up)
     (when (string-match-p "\\.org\\'" file)
@@ -361,7 +362,9 @@ otherwise it's assumed to be an Info file."
       (erase-buffer)
       (cond
        ((/= 0 (call-process "makeinfo" nil t nil
-                            "--no-split" file "-o" output))
+                            "-I" docs-directory
+                            "--no-split" file
+                            "-o" output))
         (message "Failed to build manual %s, see buffer %S"
                  file (buffer-name)))
        ((/= 0 (call-process "install-info" nil t nil