Quieten without-x, without-xml2 builds

* lisp/help.el (x-display-pixel-height, x-display-pixel-width):
* lisp/image.el (image-flush, image-size):
* lisp/textmodes/sgml-mode.el (libxml-parse-html-region):
Declare for compiler.

1 files changed, 3 insertions, 0 deletions

diff --git a/lisp/help.el b/lisp/help.el
index dcf1f32069b..e9235460329 100644
--- a/lisp/help.el
+++ b/lisp/help.el
@@ -1059,6 +1059,9 @@ is currently activated with completion."
           (setq minor-modes (cdr minor-modes)))))
     result))
 
+(declare-function x-display-pixel-height "xfns.c" (&optional terminal))
+(declare-function x-display-pixel-width "xfns.c" (&optional terminal))
+
 ;;; Automatic resizing of temporary buffers.
 (defcustom temp-buffer-max-height
   (lambda (_buffer)