build: update waf to version 2.0.24

Change-Id: I2b367680138454e51c7aa82d3b93de70d4573d12
diff --git a/wscript b/wscript
index 65d5c59..136349d 100644
--- a/wscript
+++ b/wscript
@@ -34,8 +34,6 @@
              tooldir=['.waf-tools'])
 
     optgrp = opt.add_option_group('NLSR Options')
-    optgrp.add_option('--with-tests', action='store_true', default=False,
-                      help='Build unit tests')
 
     optgrp.add_option('--with-chronosync', dest='with_chronosync', action='store_true', default=False,
                       help='Build with ChronoSync support')
@@ -52,6 +50,9 @@
     optgrp.add_option('--without-svs', dest='with_svs', action='store_false', default=False,
                       help='Build without State Vector Sync support')
 
+    optgrp.add_option('--with-tests', action='store_true', default=False,
+                      help='Build unit tests')
+
 def configure(conf):
     conf.load(['compiler_cxx', 'gnu_dirs',
                'default-compiler-flags', 'boost',