[pango] meson: skip pangoxft headers for the Windows gtk-doc build

[Christoph Reiter <creiter src gnome org>]

commit 8e86f613160d023257d041ff24f94c88a8e12a46
Author: Christoph Reiter <reiter christoph gmail com>
Date:   Sun Apr 8 19:16:49 2018 +0200

    meson: skip pangoxft headers for the Windows gtk-doc build
    
    The API isn't available on Windows and gtk-doc fails with a
    linker error otherwise.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=795045

 docs/meson.build |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/docs/meson.build b/docs/meson.build
index c784149..9122dc3 100644
--- a/docs/meson.build
+++ b/docs/meson.build
@@ -45,6 +45,11 @@ if host_system != 'windows'
     'pangocairo-win32.h',
     'pangowin32.h',
   ]
+else
+  private_headers += [
+    'pangoxft.h',
+    'pangoxft-render.h',
+  ]
 endif
 
 content_files = [