Fix linking error LLGroupList::Params::Params()

indra/newview/llgrouplist.cpp

@@ -69,6 +69,11 @@ public:
 //static const LLGroupComparator GROUP_COMPARATOR;
 static LLGroupComparator GROUP_COMPARATOR; // <ND/> const makes GCC >= 4.6 very angry about not user defined default ctor.
 
+LLGroupList::Params::Params()
+: for_agent("for_agent", true)
+{
+}
+
 LLGroupList::LLGroupList(const Params& p)
 :	LLFlatListViewEx(p)
 	, mForAgent(p.for_agent)