[gegl] docs: No longer exclude ctx.h from gtk-doc

[Øyvind "pippin" Kolås <ok src gnome org>]

commit 4092eb49451128c0448fad032ea5cbff40f92c59
Author: Øyvind Kolås <pippin gimp org>
Date:   Sun Dec 19 00:23:05 2021 +0100

    docs: No longer exclude ctx.h from gtk-doc
    
    This reverses cf7e328c931a4, ctx.h is no longer part of the gegl/
    directory subtree but part of operations/

 docs/reference/meson.build | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/docs/reference/meson.build b/docs/reference/meson.build
index 2348cec92..8193a25ba 100644
--- a/docs/reference/meson.build
+++ b/docs/reference/meson.build
@@ -12,7 +12,6 @@ if gtkdoc_scan.found()
       project_source_root / 'gegl',
       project_build_root / 'gegl',
     ],
-    ignore_headers: ['ctx.h'],
     fixxref_args: [
       '--html-dir=@0@'.format(gegl_gtk_docdir),
       '--extra-dir=@0@'.format(glib_gtk_docdir),