Even though this PRNG is not meant to be cryptographically secure, there is
no reason not to get a high-quality seed.
CC: Stephen Hemminger <shemminger@vyatta.com>
Until now this library has based its random number upon those returned
by libc's rand() function. This has always bugged me--it is not a good
solution since rand() varies in quality so much. This commit changes
the random library to use a simple but high-quality PRNG.
