[gjs: 3/9] CI: Fix stdint.h IWYU workaround

[Philip Chimento <pchimento src gnome org>]

commit ea4ecac693d50b5c8c133a990f36ad2786284b6b
Author: Philip Chimento <philip chimento gmail com>
Date:   Thu Dec 10 15:32:56 2020 -0800

    CI: Fix stdint.h IWYU workaround
    
    This handles the case where IWYU wants to add <cstdint> but <stdint.h> is
    already included.

 tools/process_iwyu.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/tools/process_iwyu.py b/tools/process_iwyu.py
index df8d1559..7d4ac181 100755
--- a/tools/process_iwyu.py
+++ b/tools/process_iwyu.py
@@ -119,7 +119,7 @@ def output():
         why = add.pop(CSTDINT, None)
         if STDINTH in remove:
             remove.pop(STDINTH, None)
-        else:
+        elif STDINTH not in all_includes:
             add[STDINTH] = why
 
     if add_fwd_header: