[gthumb] do not include main.h in the public api

[Paolo Bacchilega <paobac src gnome org>]

commit 3f972ffb5cc9a19e3246a629f4b0b9eb27de3acf
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Sun Feb 7 12:23:23 2021 +0100

    do not include main.h in the public api

 gthumb/meson.build | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/gthumb/meson.build b/gthumb/meson.build
index 64c93578..7d339482 100644
--- a/gthumb/meson.build
+++ b/gthumb/meson.build
@@ -107,7 +107,6 @@ public_header_files = [
   'gth-window.h',
   'gtk-utils.h',
   'gvaluehash.h',
-  'main.h',
   'pixbuf-cache.h',
   'pixbuf-io.h',
   'pixbuf-utils.h',