Fix makefile to force bash instead of sh for benchmarks
Fix makefile to force bash instead of sh for benchmarks

oxyc/luaparse,mathiasbynens/luaparse,npmcomponent/oxyc-luaparse,oxyc/luaparse,mathiasbynens/luaparse,mathiasbynens/luaparse,oxyc/luaparse,npmcomponent/oxyc-luaparse