automake1.15-perl5.22-regex-error-fix

A patch to port(fix a regex error) automake1.15 to Perl v5.22.0 and later. It can fix such error when compile qsdk on ubuntu 18.04: Unescaped left brace in regex is illegal here in regex; marked by <-- HERE in m/\${ <-- HERE ([^ \t=:+{}]+)}/ at ./bin/automake.tmp line ...