[v3] Patch to twister_rand_gen_* to use tr1::random

[Paolo Carlini]

Hi,

the below should most of the runtime fails which we are seeing on 64-bit 
machines for ext/pb_ds/regression/*rand, for sure does so on ia64-linux. 
For the latter one remains but first blush seems a different issue:

terminate called after throwing an instance of 
'pb_ds::test::forced_exception'
FAIL: ext/pb_ds/regression/priority_queue_rand.cc execution test

Paolo.

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