fix warning: a function declaration without a prototype is deprecated in all versions of C

make savestr() static and remove it from dlpidefs.h since it is not used outside of dlpi.c

inc/dlpidefs.h

@@ -4,6 +4,5 @@
 int setup_dlpi_dev(char *device);
 void flush_dlpi(int fd);
 int dlpi_devtype(int fd);
-char *savestr(char *s);
 int dlunitdatareq(int fd, u_char *addrp, int addrlen, u_long minpri, u_long maxpri, u_char *datap, int datalen);
 #endif