usedpackage_native_routine_registration_skeleton(".") to fix R CMD ch…

…eck note

note:
File ‘VPdtw/libs/VPdtw.so’:
    Found no calls to: ‘R_registerRoutines’, ‘R_useDynamicSymbols’

  It is good practice to register native routines and to disable symbol
  search.

src/VPdtw_init.c

@@ -0,0 +1 @@
+#include <stdlib.h> // for NULL#include <R_ext/Rdynload.h>/* .C calls */extern void dilation(void *, void *, void *, void *);extern void signalMatchWrapABand(void *, void *, void *, void *, void *, void *, void *);static const R_CMethodDef CEntries[] = {    {"dilation",             (DL_FUNC) &dilation,             4},    {"signalMatchWrapABand", (DL_FUNC) &signalMatchWrapABand, 7},    {NULL, NULL, 0}};void R_init_VPdtw(DllInfo *dll){    R_registerRoutines(dll, CEntries, NULL, NULL, NULL);    R_useDynamicSymbols(dll, FALSE);}