[gdk-pixbuf] docs: Ignore lzw.h

[Emmanuele Bassi <ebassi src gnome org>]

commit 51543b3d6df86479b532aa35089bbcbe15121a1c
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Aug 14 13:54:24 2019 +0100

    docs: Ignore lzw.h
    
    It's private API.

 docs/meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/docs/meson.build b/docs/meson.build
index 0d90b4755..175380e6a 100644
--- a/docs/meson.build
+++ b/docs/meson.build
@@ -30,6 +30,7 @@ private_headers = [
   'io-gif-animation.h',
   'xpm-color-table.h',
   'test-images.h',
+  'lzw.h',
 ]
 
 if not get_option('x11')