cups-compiler.m4: Check for -fstack-protector-strong #285
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GCC can provide even stronger stack protection, let's use it if
available. Otherwise fall back to -fstack-protector.
I found this during development on centos stream 9 - I wasn't able to pass -fstack-protector-strong (which is one of the reqs in centos stream 9/RHEL 9) into compiled libcups.so.2, then found out gcc chose more generic -fstack-protector because of configure check.