sufficient RFFI for library(grid)

...rc/com/oracle/truffle/r/engine/RRuntimeASTAccessImpl.java

.../src/com/oracle/truffle/r/library/grid/GridFunctions.java

com.oracle.truffle.r.native/fficall/jni/src/alloc.c

...oracle.truffle.r.native/fficall/jni/src/graphicsdevices.c

com.oracle.truffle.r.native/fficall/jni/src/graphicsengine.c

com.oracle.truffle.r.native/fficall/jni/src/misc.c

com.oracle.truffle.r.native/fficall/jni/src/rf_functions.c

com.oracle.truffle.r.native/fficall/jni/src/rfficall.c

com.oracle.truffle.r.native/fficall/jni/src/rffiutils.c

com.oracle.truffle.r.native/fficall/jni/src/rffiutils.h

...ruffle/r/nodes/builtin/base/foreign/ForeignFunctions.java

...com/oracle/truffle/r/runtime/ffi/jnr/JNR_RFFIFactory.java

...untime/src/com/oracle/truffle/r/runtime/ffi/GridRFFI.java

....r.runtime/src/com/oracle/truffle/r/runtime/ffi/RFFI.java

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