Bump library version numbers.

ChangeLog

 2014-12-08  Niels Möller  <nisse@lysator.liu.se>
 
+	* configure.ac (LIBNETTLE_MAJOR): Bump major number, now 6.
+	(LIBHOGWEED_MAJOR): Bump major number, now 5.
+
 	From Nikos Mavrogiannopoulos. Support for versioned symbols.
 	* aclocal.m4 (LD_VERSION_SCRIPT): New macro. Substitute
 	EXTRA_LINKER_FLAGS and EXTRA_HOGWEED_LINKER_FLAGS.

configure.ac

@@ -10,10 +10,10 @@ AC_CONFIG_AUX_DIR([.])
 
 AC_CONFIG_HEADER([config.h])
 
-LIBNETTLE_MAJOR=5
+LIBNETTLE_MAJOR=6
 LIBNETTLE_MINOR=0
 
-LIBHOGWEED_MAJOR=4
+LIBHOGWEED_MAJOR=5
 LIBHOGWEED_MINOR=0
 
 AC_CANONICAL_HOST