Nowadays do we need use extern "C" in c++ especially for c++ 11

Question

I currently review and learn some github programs, and I fund in a hpp file:
there is extern "C" to cover all the c header file like stdio.h, stdint.h and so on.

extern "C"
{
    #include <stdio.h>
    #include <stdint.h>
    #include <stdlib.h>
    #include <inttypes.h>
}

I also google how it works and I just wondering if we still need to do that. And which way is better?

1) to cover c header by extern "C";
2) just straightly include that c header files;