Update install-sh script to the latest available version

The version of install-sh we have was made over 2 decades ago,
and last edited 9 years ago.

I updated the script by running autoreconf -fiv on autoconf 2.71,
and autoreconf automatically updated the script.

Author: Rose

CHANGES

@@ -49,6 +49,7 @@ DayOfTheWeek, Month DD, YYYY / The Tcpdump Group
       Add a configure option to help debugging (--enable-instrument-functions)
       autoconf: Add autogen.sh, remove configure and config.h.in and put
         these generated files in the release tarball.
+      autoconf: Update install-sh script to the latest available version.
       At build time require a proof of suitable snprintf(3) implementation in
         libc (and document Solaris 9 as unsupported because of that).
       Autoconf: Remove detection of early IPv6 stacks.