tests: Add ignore for stdin not terminal

Change-Id: I496a9f3a0156557415d455dd2ca54c92577ca5f5
Signed-off-by: Jason Lowe-Power <jason@lowepower.com>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/17455
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>

tests/gem5/verifier.py

@@ -135,6 +135,7 @@ class MatchStdout(DerivedGoldStandard):
             re.compile('^command line:'),
             re.compile("^Couldn't import dot_parser,"),
             re.compile("^info: kernel located at:"),
+            re.compile("^info: Standard input is not a terminal"),
             re.compile("^Couldn't unlink "),
             re.compile("^Using GPU kernel code file\(s\) "),
         ]