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add warnings to std/sysrand (#17191)

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* remove unnecessary when statement

* remove outdated codes

* add warnings to std/sysrand

* Update lib/std/sysrand.nim

Co-authored-by: konsumlamm <44230978+konsumlamm@users.noreply.github.com>

Co-authored-by: Timothee Cour <timothee.cour2@gmail.com>
Co-authored-by: konsumlamm <44230978+konsumlamm@users.noreply.github.com>
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flywind 2021-02-27 03:06:20 +08:00 • committed by GitHub
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lib/std/sysrand.nim
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@ -7,6 +7,10 @@
# distribution, for details about the copyright.
#
## .. warning:: This module was added in Nim 1.6. If you are using it for cryptographic purposes,
## keep in mind that so far this has not been audited by any security professionals,
## therefore may not be secure.
##
## `std/sysrand` generates random numbers from a secure source provided by the operating system.
## It is also called Cryptographically secure pseudorandom number generator.
## It should be unpredictable enough for cryptographic applications,