replace deprecated java interop usage

...ngine/src/com/oracle/truffle/r/engine/EngineRootNode.java

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

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

...r/ffi/impl/llvm/upcalls/BytesToNativeCharArrayCallMR.java

...ruffle/r/ffi/impl/nfi/TruffleNFI_DownCallNodeFactory.java

...fle/r/library/fastrGrid/grDevices/InitWindowedDevice.java

...cle/truffle/r/nodes/builtin/base/ConnectionFunctions.java

...in/src/com/oracle/truffle/r/nodes/builtin/base/Names.java

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

...om/oracle/truffle/r/nodes/builtin/fastr/FastRContext.java

...c/com/oracle/truffle/r/nodes/builtin/fastr/FastRHelp.java

...om/oracle/truffle/r/nodes/builtin/fastr/FastRInterop.java

...om/oracle/truffle/r/nodes/castsTests/CastBuilderTest.java

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

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

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

com.oracle.truffle.r.pkgs/rJava/R/call.R

com.oracle.truffle.r.pkgs/rJava/R/jfirst.R

com.oracle.truffle.r.pkgs/rJava/src/Makevars

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