Utility for using the RDRAND instruction

On some x86_64 hardware the RDRAND instruction returns 64bits of entropy
from an on-chip random number generator. RDRAND is not recommended as an
exclusive source of entropy for cryptographic applications.

https://en.wikipedia.org/wiki/RdRand

recipes/pkg/test-rdrand/README

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+Test for the RDRAND utility.

recipes/pkg/test-rdrand/archives

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+_/src/test-rdrand

recipes/pkg/test-rdrand/hash

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+2019-02-05-b c847249e6a9161857212672d571d51e9ab537081

recipes/pkg/test-rdrand/runtime

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+<runtime ram="1M" caps="64" binary="test-rdrand">
+
+	<events>
+		<timeout meaning="failed" sec="20" />
+		<log     meaning="succeeded">--- RDRAND test finished ---</log>
+		<log     meaning="failed"   >Error: </log>
+	</events>
+
+	<content>
+		<rom label="ld.lib.so"/>
+		<rom label="test-rdrand"/>
+	</content>
+
+	<config/>
+
+</runtime>