win32: fix trivial warnings with send and recv

Windows defines the second argument to be of type const char* and char* but posix defines it to be const void* and void*

https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-send https://docs.microsoft.com/en-us/windows/win32/api/winsock2/nf-winsock2-recv https://pubs.opengroup.org/onlinepubs/9699919799/functions/send.html https://pubs.opengroup.org/onlinepubs/9699919799/functions/recv.html

Signed-off-by: Christopher Degawa ccom@randomderp.com