Fix up the random number stuff.

Fix up the random number stuff.

SConscript:
    compile the random number generator stuff into m5
base/random.cc:
    we need to define our destructor
base/random.hh:
    Since there's no state, just makes all of these get functions static

--HG--
extra : convert_revision : 9d4b8abd57367391a8ecda3914b1d912d9c64185