Update Makefile
Update Makefile

fix link error while run "make hiredis-example-libuv":

undefined reference to `clock_gettime'
undefined reference to `clock_getres'
liulingfree/hiredis,rangan337/hiredis,tattsun/hiredis,h1048576/hiredis,olgeni/hiredis,chenlicong0821/hiredis,owent-contrib/hiredis,redis/hiredis,jinguoli/hiredis,liulingfree/hiredis,jinguoli/hiredis,olgeni/hiredis,owent-contrib/hiredis,tattsun/hiredis,thomaslee/hiredis,Yhgenomics/hiredis,Yhgenomics/hiredis,charsyam/hiredis,jqk6/hiredis,xjzhou/hiredis,hidebug/hiredis,chenlicong0821/hiredis,redis/hiredis,xjzhou/hiredis,charsyam/hiredis,arinal/hiredis,yiliaofan/hiredis,galdor/hiredis,jinguoli/hiredis,nokiddin/hiredis,thomaslee/hiredis,hidebug/hiredis,rangan337/hiredis,galdor/hiredis,redis/hiredis