bench: fixed program name in the usage output of the "pcre" program.
bench: fixed program name in the usage output of the "pcre" program.

MarginC/sregex,MarginC/sregex,openresty/sregex,MarginC/sregex,MarginC/sregex,openresty/sregex,openresty/sregex,MarginC/sregex,openresty/sregex