dropbear: bump version

Fixes a number of issues. From the changelog:

- Avoid getting stuck in a loop writing huge key files, reported by Bruno
  Thomsen
- Avoid crash on exit due to cleaned up keys before last packets are sent,
  debugged by Ronald Wahl
- Fix a race condition in rekeying where Dropbear would exit if it received a
  still-in-flight packet after initiating rekeying. Reported by Oliver Metz.
  This is a longstanding bug but is triggered more easily since 2013.57
- Ensure that generated RSA keys are always exactly the length
  requested. Previously Dropbear always generated N+16 or N+15 bit keys.
  Thanks to Unit 193
- Fix DROPBEAR_CLI_IMMEDIATE_AUTH mode which saves a network round trip if the
  first public key succeeds. Still not enabled by default, needs more
  compatibility testing with other implementations.
- Fix signal handlers so that errno is saved, thanks to Erik Ahlén for a patch
  and Mark Wickham for independently spotting the same problem.

And at the same time get rid of the TIMEVAL_TO_TIMESPEC as dropbear provides a
fallback implementation if not available (and has done so since 2006).

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/dropbear/dropbear-fix-missing-TIMEVAL_TO_TIMESPEC.patch

@@ -1,11 +0,0 @@
-diff -ur dropbear-0.48/includes.h dropbear-0.48-patched/includes.h
---- dropbear-0.48/includes.h	2006-03-09 09:06:02.000000000 -0600
-+++ dropbear-0.48-patched/includes.h	2006-03-15 22:36:12.000000000 -0600
-@@ -35,6 +35,7 @@
- #include <sys/param.h> /* required for BSD4_4 define */
- #include <sys/socket.h>
- #include <sys/stat.h>
-+#define _GNU_SOURCE
- #include <sys/time.h>
- #include <sys/un.h>
- #include <sys/wait.h>

package/dropbear/dropbear.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-DROPBEAR_VERSION = 2013.62
+DROPBEAR_VERSION = 2014.63
 DROPBEAR_SITE = http://matt.ucc.asn.au/dropbear/releases
 DROPBEAR_SOURCE = dropbear-$(DROPBEAR_VERSION).tar.bz2
 DROPBEAR_TARGET_BINS = dbclient dropbearkey dropbearconvert scp ssh