link to GnuR files used unmodified by stats package; move interv.c to appl

com.oracle.truffle.r.native/builtinlibs/Makefile

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

com.oracle.truffle.r.native/library/stats/src/bsplvd.f

com.oracle.truffle.r.native/library/stats/src/bvalue.f

com.oracle.truffle.r.native/library/stats/src/bvalus.f

com.oracle.truffle.r.native/library/stats/src/eureka.f

com.oracle.truffle.r.native/library/stats/src/hclust.f

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

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

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

com.oracle.truffle.r.native/library/stats/src/kmns.f

com.oracle.truffle.r.native/library/stats/src/lminfl.f

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

com.oracle.truffle.r.native/library/stats/src/loessf.f

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

com.oracle.truffle.r.native/library/stats/src/ppr.f

com.oracle.truffle.r.native/library/stats/src/qsbart.f

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

com.oracle.truffle.r.native/library/stats/src/sgram.f

com.oracle.truffle.r.native/library/stats/src/sinerp.f