[NFC][hwasan] Check __GLIBCXX__ before checking _GLIBCXX_RELEASE in test
_GLIBCXX_RELEASE wasn't defined before GCC 7.1. This is another follow-up to https://reviews.llvm.org/D119161
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_GLIBCXX_RELEASE wasn't defined before GCC 7.1. This is another follow-up to https://reviews.llvm.org/D119161