[gjs: 4/6] CI: ignore warning about pragma once in IWYU

[Philip Chimento <pchimento src gnome org>]

commit b79eae6c47979768b83a0b36e283122be20df898
Author: Philip Chimento <philip chimento gmail com>
Date:   Sat Oct 9 13:01:41 2021 -0700

    CI: ignore warning about pragma once in IWYU

 tools/run_iwyu.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/tools/run_iwyu.sh b/tools/run_iwyu.sh
index 7e1db246..295d07a0 100755
--- a/tools/run_iwyu.sh
+++ b/tools/run_iwyu.sh
@@ -44,7 +44,8 @@ fi
 echo "files: $files"
 
 IWYU="python3 $(which iwyu_tool || which iwyu_tool.py) -p ."
-IWYU_RAW="include-what-you-use -xc++ -std=c++17 -Xiwyu --keep=config.h"
+IWYU_ARGS="-Wno-pragma-once-outside-header"
+IWYU_RAW="include-what-you-use -xc++ -std=c++17 -Xiwyu --keep=config.h $IWYU_ARGS"
 IWYU_RAW_INC="-I. -I.. $(pkg-config --cflags gobject-introspection-1.0 mozjs-78)"
 PRIVATE_MAPPING="-Xiwyu --mapping_file=$SRCDIR/tools/gjs-private-iwyu.imp -Xiwyu --keep=config.h"
 PUBLIC_MAPPING="-Xiwyu --mapping_file=$SRCDIR/tools/gjs-public-iwyu.imp"