Revert the DEVRANDOM_WAIT feature
The DEVRANDOM_WAIT feature added a select() call to wait for the `/dev/random` device to become readable before reading from the `/dev/urandom` device. It was introduced in commit 38023b87 in order to mitigate the fact that the `/dev/urandom` device does not block until the initial seeding of the kernel CSPRNG has completed, contrary to the behaviour of the `getrandom()` system call. It turned out that this change had negative side effects on performance which were not acceptable. After some discussion it was decided to revert this feature and leave it up to the OS resp. the platform maintainer to ensure a proper initialization during early boot time. Fixes #9078 This partially reverts commit 38023b87 . Reviewed-by:Tim Hudson <tjh@openssl.org> Reviewed-by:
Viktor Dukhovni <viktor@openssl.org> (Merged from https://github.com/openssl/openssl/pull/9084)
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