Fixed bug #75097 (gethostname fails if your host name is 64 chars long)

Fixed bug #75097 (gethostname fails if your host name is 64 chars long)

PHP contained two different off-by-one errors, which are fixed here. First,
it created a buffer of size HOST_NAME_MAX, not adding space for a null
terminator. Second, it subtracted 1 from the size of that buffer when passing
its size to gethostname(), despite gethostname() expecting it to be a buffer
size including space for a terminating null byte, not a string length.