nettle: changed to build at cross stage if requested

security/nettle/nettle.desc

@@ -2,7 +2,7 @@
 [COPY] This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 [COPY]
 [COPY] Filename: package/.../nettle/nettle.desc
-[COPY] Copyright (C) 2011 - 2012 The OpenSDE Project
+[COPY] Copyright (C) 2011 - 2013 The OpenSDE Project
 [COPY]
 [COPY] More information can be found in the files COPYING and README.
 [COPY]
@@ -29,6 +29,6 @@
 [L] GPL LGPL
 [S] Stable
 [V] 2.4
-[P] X -----5---9 108.700
+[P] X -?---5---9 108.700
 
 [D] 2914115986 nettle-2.4.tar.gz http://www.lysator.liu.se/~nisse/archive/