make grep's path adjustable for PANICTRACE + more bits
Mac OS X doesn't have /bin/grep, only /usr/bin/grep. Grr. Don't try to parse PANICTRACE_GLIBC if the field doesn't exist.
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Mac OS X doesn't have /bin/grep, only /usr/bin/grep. Grr. Don't try to parse PANICTRACE_GLIBC if the field doesn't exist.