Fix more Truffle API deprecation warnings

.../com/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_Call.java

...oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_NativeDLL.java

.../truffle/r/ffi/impl/llvm/TruffleLLVM_UpCallsRFFIImpl.java

...m/oracle/truffle/r/ffi/impl/llvm/TruffleLLVM_UserRng.java

...l/src/com/oracle/truffle/r/ffi/impl/nfi/TruffleNFI_C.java

...rc/com/oracle/truffle/r/ffi/impl/nfi/TruffleNFI_Call.java

...com/oracle/truffle/r/ffi/impl/nfi/TruffleNFI_Context.java

...le/truffle/r/ffi/impl/nfi/TruffleNFI_UpCallsRFFIImpl.java

...com/oracle/truffle/r/ffi/impl/nfi/TruffleNFI_UserRng.java

...n/src/com/oracle/truffle/r/nodes/builtin/base/Unlist.java

...acle/truffle/r/nodes/access/vector/ExtractVectorNode.java

...acle/truffle/r/nodes/access/vector/ReplaceVectorNode.java

...nodes/src/com/oracle/truffle/r/nodes/control/ForNode.java

...s/src/com/oracle/truffle/r/nodes/control/RLengthNode.java

...es/src/com/oracle/truffle/r/nodes/function/RCallNode.java

.../src/com/oracle/truffle/r/nodes/unary/PrecedenceNode.java

...me/src/com/oracle/truffle/r/runtime/context/RContext.java

...com/oracle/truffle/r/runtime/ffi/DownCallNodeFactory.java

...ime/src/com/oracle/truffle/r/runtime/ffi/InvokeCNode.java

...c/com/oracle/truffle/r/runtime/ffi/VectorRFFIWrapper.java