[gjs] CI: Update IWYU includes

[Philip Chimento <pchimento src gnome org>]

commit ef0f9dbee71fa5458ef8b3de786d3b65641f143f
Author: Philip Chimento <philip chimento gmail com>
Date:   Sat Aug 8 12:33:45 2020 -0700

    CI: Update IWYU includes

 modules/print.cpp     | 1 -
 tools/process_iwyu.py | 4 ++++
 2 files changed, 4 insertions(+), 1 deletion(-)
---
diff --git a/modules/print.cpp b/modules/print.cpp
index 5c82c5c7..bccbcfed 100644
--- a/modules/print.cpp
+++ b/modules/print.cpp
@@ -17,7 +17,6 @@
 #include <js/RootingAPI.h>
 #include <js/TypeDecls.h>
 #include <js/Utility.h>  // for UniqueChars
-#include <js/Value.h>
 #include <jsapi.h>
 
 #include "gjs/jsapi-util.h"
diff --git a/tools/process_iwyu.py b/tools/process_iwyu.py
index 786bb67f..c7761ca4 100755
--- a/tools/process_iwyu.py
+++ b/tools/process_iwyu.py
@@ -65,6 +65,10 @@ FALSE_POSITIVES = (
     ('gi/private.cpp', '#include <algorithm>', 'for max'),
     ('gjs/importer.cpp', '#include <algorithm>', 'for max'),
     ('modules/cairo-context.cpp', '#include <algorithm>', 'for max'),
+
+    # Weird false positive on some versions of IWYU
+    ('gi/arg.cpp', 'struct _GHashTable;', ''),
+    ('gi/arg.cpp', 'struct _GVariant;', ''),
 )