Use OQS_MEM_cleanse() instead of memset() (#2158)

Use OQS_MEM_cleanse() instead of memset() (#2158)

* Use OQS_MEM_cleanse() instead of memset()

This is needed for secret objects as memset
maybe optimized out by the compiler.

Signed-off-by: Hussain1811 <Sadiq.Hussain.M@ibm.com>
* Skip failing CI test (#2157)

* Skip failing CI test

Signed-off-by: Douglas Stebila <dstebila@uwaterloo.ca>
* Fix typo

Signed-off-by: Douglas Stebila <dstebila@uwaterloo.ca>
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Signed-off-by: Douglas Stebila <dstebila@uwaterloo.ca>
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Signed-off-by: Hussain1811 <Sadiq.Hussain.M@ibm.com>
Signed-off-by: Douglas Stebila <dstebila@uwaterloo.ca>
Co-authored-by: Hussain1811 <Sadiq.Hussain.M@ibm.com>
Co-authored-by: Douglas Stebila <dstebila@users.noreply.github.com>