[gnome-shell] build: Remove st-private.h from "public" headers

[Florian Müllner <fmuellner src gnome org>]

commit d16094774b8e709d90ad33530fbfadecec6ec825
Author: Florian Müllner <fmuellner gnome org>
Date:   Tue Sep 10 15:49:39 2019 +0200

    build: Remove st-private.h from "public" headers
    
    It is currently listed both as public and private header, which is
    clearly bonkers. As the name implies, the latter is correct ...
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/709

 src/st/meson.build | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/src/st/meson.build b/src/st/meson.build
index 764ff0db48..4cbebace77 100644
--- a/src/st/meson.build
+++ b/src/st/meson.build
@@ -14,7 +14,6 @@ st_headers = [
   'st-icon-colors.h',
   'st-image-content.h',
   'st-label.h',
-  'st-private.h',
   'st-scrollable.h',
   'st-scroll-bar.h',
   'st-scroll-view.h',