[packages] btpd: update to 0.16

* drop the openssl changes that were re-added in r16657
 * update to current gnulib sha1 code
 * re-add gnulib config header guard
 * mark conffile
 * use PKG_INSTALL


git-svn-id: svn://svn.openwrt.org/openwrt/packages@24776 3c298f89-4303-0410-b956-a3cf2f4a3e73

net/btpd/patches/001-gettime.patch

@@ -1,6 +1,5 @@
-diff -urN btpd-0.15/evloop/timer.c btpd-0.15-hack/evloop/timer.c
---- btpd-0.15/evloop/timer.c	2009-02-09 14:12:28.000000000 -0500
-+++ btpd-0.15-hack/evloop/timer.c	2009-06-19 21:41:02.000000000 -0400
+--- a/evloop/timer.c
++++ b/evloop/timer.c
 @@ -14,7 +14,7 @@
  int
  evtimer_gettime(struct timespec *ts)