Replace symbolic links on urxvt package

# ls -l ts/5.1/packages/urxvt/bin
total 0
lrwxrwxrwx 1 root root 5 Fev 24 15:31 rxvt -> urxvt
lrwxrwxrwx 1 root root 5 Fev 24 15:31 xterm -> urxvt