Tests: Avoid running C++11 test on GNU < 4.7
The test added in !7803 (merged) requires that the compiler support C++11 mode, so do not run it on GNU compilers that are too old.
Backport: release
The test added in !7803 (merged) requires that the compiler support C++11 mode, so do not run it on GNU compilers that are too old.
Backport: release