[PATCH v2] Add getrandom implementation [BZ #17252]

[Florian Weimer]

The attached patch does not attempt to make it less likely that the 
getrandom emulation will fail.  The file descriptor is kept open only 
for the duration of the call.  I move the declaration to <sys/random.h> 
(a new file) and added some documentation.

I kept the protection against symbol interposition.  I dropped the 
getrandom alias because it would lead to compile failures because 
certain forms of autoconf checks would succeed, but compilation would 
likely fail because neither <stdlib.h> nor <unistd.h> declare getrandom.

It looks like I have to split all GRND_RANDOM tests into an xtest 
because on idle build servers, even the few bytes that are currently 
consumed with GRND_RANDOM cause very long blocking, beyond any 
reasonable test timeout.

Thanks,
Florian
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