Source copied from ENet version 1.2.1

Rename "time.h" to "enet_time.h"

protocol.c:
    This reduces confusion for some compilers that aren't sure what to include.

    Replace
        #include "enet/time.h"
    with
        #include "enet/enet_time.h"

enet.h
    If you have a low latency connection, a 5 second network outage will drop your connection.
    This changes that to 30 second timeout.

    Replace
        ENET_PEER_TIMEOUT_MINIMUM              = 5000,
    with
        ENET_PEER_TIMEOUT_MINIMUM              = 30000,

list.h
    Add __cplusplus handling.

    #ifdef __cplusplus
    extern "C"
    {
    #endif

    #ifdef __cplusplus
    }
    #endif

