[pango/pango2] pangodwrite-fontmap.cpp: Try to fix MinGW64 builds

[Matthias Clasen <matthiasc src gnome org>]

commit 201822301ba3e8c44801b7fb1c6335fc53040fdd
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Jun 15 15:13:19 2022 +0800

    pangodwrite-fontmap.cpp: Try to fix MinGW64 builds
    
    Include initguid.h, which is necessary for IID_IDWriteFactory.

 pango/pangodwrite-fontmap.cpp | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/pango/pangodwrite-fontmap.cpp b/pango/pangodwrite-fontmap.cpp
index be8d9104..c932c2de 100644
--- a/pango/pangodwrite-fontmap.cpp
+++ b/pango/pangodwrite-fontmap.cpp
@@ -22,6 +22,7 @@
 #include "config.h"
 
 #include <windows.h>
+#include <initguid.h>
 #include <dwrite.h>
 
 #include <hb-ot.h>