8275008: gtest build failure due to stringop-overflow warning with gcc11

Reviewed-by: phh, clanger
Backport-of: c55dd365e3463670697b09de0ff70877203e5a69

make/hotspot/lib/CompileGtest.gmk

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2016, 2021, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -77,7 +77,7 @@ $(eval $(call SetupNativeCompilation, BUILD_GTEST_LIBJVM, \
     CFLAGS_windows := -EHsc, \
     CFLAGS_solaris := -DGTEST_HAS_EXCEPTIONS=0 -library=stlport4 +d, \
     CFLAGS_macosx := -DGTEST_OS_MAC=1, \
-    DISABLED_WARNINGS_gcc := undef, \
+    DISABLED_WARNINGS_gcc := undef stringop-overflow, \
     DISABLED_WARNINGS_clang := undef switch format-nonliteral \
         tautological-undefined-compare $(BUILD_LIBJVM_DISABLED_WARNINGS_clang), \
     DISABLED_WARNINGS_solstudio := identexpected, \