PATCH random/rndgetentropy.c: fix build failure on macOS

[NIIBE Yutaka]

Hello,

Christoph Badura <bad at bsd.de> wrote:
> libgcrypt fails in rndgetentropy.c because the prototype for getentropy()
> is missing.  The prototype is provided by sys/random.h per the man pages.

Thank you for your report.

Using HAVE_SYS_RANDOM_H, fixed in the commit of:

	3d353782d84b9720262d7b05adfae3aef7ff843b
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