Add exemption for make.bat in checks for tabs

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/tests/scripts/check_files.py b/tests/scripts/check_files.py
index 352b55e..7cb3e0b 100755
--- a/tests/scripts/check_files.py
+++ b/tests/scripts/check_files.py
@@ -350,6 +350,7 @@
         ".sln",
         "/Makefile",
         "/Makefile.inc",
+        "/make.bat",
         "/generate_visualc_files.pl",
     ])