Replace dynamic_cast with static_cast as these never actually need or seem to...

Replace dynamic_cast with static_cast as these never actually need or seem to be checked, except the one.

indra/llappearance/llavatarjoint.cpp

@@ -167,7 +167,7 @@ void LLAvatarJoint::updateJointGeometry()
 	for (joints_t::iterator iter = mChildren.begin();
 		 iter != mChildren.end(); ++iter)
 	{
-		LLAvatarJoint* joint = dynamic_cast<LLAvatarJoint*>(*iter);
+		LLAvatarJoint* joint = static_cast<LLAvatarJoint*>(*iter);
 		joint->updateJointGeometry();
 	}
 }

indra/newview/llviewerjoint.cpp

@@ -143,7 +143,7 @@ U32 LLViewerJoint::render( F32 pixelArea, BOOL first_pass, BOOL is_dummy )
 	//----------------------------------------------------------------
 	for (LLJoint* j : mChildren)
 	{
-		LLAvatarJoint* joint = dynamic_cast<LLAvatarJoint*>(j);
+		LLAvatarJoint* joint = static_cast<LLAvatarJoint*>(j);
 		F32 jointLOD = joint ? joint->getLOD() : 0;
 		if (pixelArea >= jointLOD || sDisableLOD)
 		{