print libfuse version

rgpgfs.c

@@ -83,5 +83,6 @@ static struct fuse_operations rgpgfs_fuse_operations = {
 };
 
 int main(int argc, char *argv[]) {
+  printf("libfuse version %s\n", fuse_pkgversion());
   return fuse_main(argc, argv, &rgpgfs_fuse_operations, NULL);
 }