util/rand_xor: add missing include statements

Fixes for:

src/util/rand_xor.c:60:13: error: implicit declaration of function 'open' [-Werror=implicit-function-declaration]
    int fd = open("/dev/urandom", O_RDONLY);
             ^~~~
src/util/rand_xor.c:60:34: error: 'O_RDONLY' undeclared (first use in this function)
    int fd = open("/dev/urandom", O_RDONLY);
                                  ^~~~~~~~

Signed-off-by: Nicolas Dechesne <[email protected]>
Reviewed-by: Eric Engestrom <[email protected]>

0 files changed, 0 insertions, 0 deletions