[gtk/gtk-3-24: 1/2] meson: only build demo manpages when demos are enabled

[Matthias Clasen <matthiasc src gnome org>]

commit ae5a29be4ff930f4a2b40adf2edc71520c751805
Author: Eli Schwartz <eschwartz archlinux org>
Date:   Tue Apr 13 22:48:39 2021 -0400

    meson: only build demo manpages when demos are enabled
    
    Installing them even when manpages are enabled, but the demos are
    disabled, produces manpages for unavailable programs...

 docs/reference/gtk/meson.build | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)
---
diff --git a/docs/reference/gtk/meson.build b/docs/reference/gtk/meson.build
index d3f55b442c..9fa282d38c 100644
--- a/docs/reference/gtk/meson.build
+++ b/docs/reference/gtk/meson.build
@@ -503,14 +503,19 @@ if get_option('man') and xsltproc.found()
     [ 'gtk-update-icon-cache', '1', ],
     [ 'gtk-encode-symbolic-svg', '1', ],
     [ 'gtk-launch', '1', ],
-    [ 'gtk3-demo', '1', ],
-    [ 'gtk3-demo-application', '1', ],
-    [ 'gtk3-widget-factory', '1', ],
-    [ 'gtk3-icon-browser', '1', ],
     [ 'gtk-builder-tool', '1', ],
     [ 'gtk-query-settings', '1', ],
   ]
 
+  if get_option('demos')
+    man_files += [
+      [ 'gtk3-demo', '1', ],
+      [ 'gtk3-demo-application', '1', ],
+      [ 'gtk3-widget-factory', '1', ],
+      [ 'gtk3-icon-browser', '1', ],
+    ]
+  endif
+
   if broadway_enabled
     man_files += [[ 'broadwayd', '1', ]]
   endif