ignore the errno EEXIST when symlink for /dev/fd & /dev/std*
ignore the errno EEXIST when symlink for /dev/fd & /dev/std*

Signed-off-by: Lai Jiangshan <b337eedf453972390e4695e362aeea2634ef4e0c@gmail.com>

bergwolf/hyperstart,laijs/hyperstart,gnawux/hyperstart,gao-feng/hyperstart,hyperhq/hyperstart,laijs/hyperstart,bergwolf/hyperstart,MarioCarrilloA/hyperstart,MarioCarrilloA/hyperstart,MarioCarrilloA/hyperstart,hyperhq/hyperstart,gnawux/hyperstart,gao-feng/hyperstart,gnawux/hyperstart