[PATCH v7] getrandom system call wrapper [BZ #17252]

[Florian Weimer]

This patch switches back to the ssize_t return time.  This goes against 
Theodore Ts'o preference, but seems to reflect the consensus from the 
largery community.

I weakened the protection against accidental interposition somewhat. 
Since the declaration is a new header file, I do not use a function-like 
macro to prevent a definition of a function named “getrandom”, and 
non-GNU compilers do not get any redirection.  The rationale is that if 
you interpose the function after including <sys/random.h>, you probably 
know what you are doing.  The redirect to __libc_getrandom still 
provides interposition protection if other translation units define a 
getrandom function without knowledge of <sys/random.h>.

Thanks,
Florian
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