[GR-6252] Variable '.Random.seed' cannot be found.

...fle.r.engine/src/com/oracle/truffle/r/engine/REngine.java

...com/oracle/truffle/r/nodes/builtin/base/GetFunctions.java

...com/oracle/truffle/r/nodes/builtin/base/RNGFunctions.java

...uffle/r/nodes/access/variables/LocalReadVariableNode.java

...le/truffle/r/nodes/access/variables/ReadVariableNode.java

...com/oracle/truffle/r/runtime/env/frame/ActiveBinding.java

...e/truffle/r/runtime/env/frame/REnvTruffleFrameAccess.java

....r.runtime/src/com/oracle/truffle/r/runtime/rng/RRNG.java

...est/src/com/oracle/truffle/r/test/ExpectedTestOutput.test

...fle/r/test/library/stats/TestRandGenerationFunctions.java