Draft: Improve openssh to check is getentropy() supported and use compat way if not

Closed Sergey S. requested to merge simsergey/aports:master into master

The version 9.1_p1 is broken for old kernels. They use getentropy() and goto fatal when error occurred, with no check error for "function is not implemented". The patch make improve to use old compatible method for getting entropy. No any side effects for devices with a fresh kernel.

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