pull native code into fastr's stats package (explicit copies for now)

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

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

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/init.c

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/modreg.h

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

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

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

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