native init.c post-review cleanups; apply same to parallel package

com.oracle.truffle.r.native/library/lib.mk

...acle.truffle.r.native/library/methods/src/methods_dummy.c

com.oracle.truffle.r.native/library/parallel/Makefile

com.oracle.truffle.r.native/library/parallel/src/init.c

com.oracle.truffle.r.native/library/parallel/src/parallel.h

com.oracle.truffle.r.native/library/stats/Makefile

...oracle.truffle.r.native/library/stats/src/gnur_extracts.c

com.oracle.truffle.r.native/library/stats/src/statsR.h

com.oracle.truffle.r.native/library/stats/src/statsR_dummy.c

com.oracle.truffle.r.native/library/tools/src/tools_dummy.c

com.oracle.truffle.r.native/library/utils/src/utils_dummy.c

mx.fastr/copyrights/overrides