Add DESTDIR support to Makefile
Add DESTDIR support to Makefile

JensRantil/beanstalkd,aidaima/beanstalkd,amyvmiwei/beanstalkd,orangeholic/beanstalkd,mickeyouyou/beanstalkd,mobliyishengyuan/beanstalkd,CompendiumSoftware/beanstalkd,tdg5/beanstalkd,handautsav/beanstalkd,lzpfmh/beanstalkd,wfxiang08/beanstalkd,ifduyue/beanstalkd,Qihoo360/beanstalkd-win,wyzssw/beanstalkd,potatosalad/beanstalkd,diditaxi/beanstalkd,cgvarela/beanstalkd,mobliyishengyuan/beanstalkd,diditaxi/beanstalkd,tdg5/beanstalkd,yetone/beanstalkd,r3jack/beanstalkd,wfxiang08/beanstalkd,CompendiumSoftware/beanstalkd,LomoX-Offical/beanstalkd-win,pinguo-xudianyang/beanstalkd,lzpfmh/beanstalkd,bmhatfield/beanstalkd,justintung/beanstalkd,kr/beanstalkd,ifduyue/beanstalkd,wyzssw/beanstalkd,mickeyouyou/beanstalkd,justintung/beanstalkd,potatosalad/beanstalkd,amyvmiwei/beanstalkd,handautsav/beanstalkd,aidaima/beanstalkd,qbdsoft/beanstalkd,Qihoo360/beanstalkd-win,LomoX-Offical/beanstalkd-win,yetone/beanstalkd,PhillipMwaniki/beanstalkd,PhillipMwaniki/beanstalkd,cgvarela/beanstalkd,pinguo-xudianyang/beanstalkd,kr/beanstalkd,bmhatfield/beanstalkd,orangeholic/beanstalkd,r3jack/beanstalkd,qbdsoft/beanstalkd,JensRantil/beanstalkd