compile (gcc 4.1.0)

("In member function 'T SGPersonalityParameter<T>::shuffle()':
28: error: there are no arguments to 'sg_random' that depend on a template
parameter, so a declaration of 'sg_random' must be available")

simgear/scene/model/persparam.hxx

@@ -5,6 +5,9 @@
 #ifndef _SG_PERSPARAM_HXX
 #define _SG_PERSPARAM_HXX 1
 
+#include <simgear/math/sg_random.h>
+
+
 template <class T>
 class SGPersonalityParameter {
 public: