try add windows compability

Signed-off-by: U-xiehuc-PC\xiehuc <xiehuc@xiehuc-PC.(none)>
trying fix libev link on windows

Signed-off-by: U-xiehuc-PC\xiehuc <xiehuc@xiehuc-PC.(none)>
remove ev.h in async.h

Signed-off-by: xiehuc <xiehuc@gmail.com>
fix md5 bug

Signed-off-by: xiehuc <xiehuc@gmail.com>
add without libev

Signed-off-by: xiehuc <xiehuc@gmail.com>
include libev in source

Signed-off-by: xiehuc <xiehuc@gmail.com>