linux and mac compile fixes.

Removed "friend MyAvatar" from Rig and JointState.
This was only there for debugging, but I accidentally committed it.

libraries/animation/src/JointState.h

@@ -26,8 +26,6 @@ class AngularConstraint;
 
 class JointState {
 public:
-    friend class MyAvatar;
-
     JointState() {}
     JointState(const JointState& other) { copyState(other); }
     JointState(const FBXJoint& joint);

libraries/animation/src/Rig.h

@@ -50,9 +50,6 @@ class Rig;
 typedef std::shared_ptr<Rig> RigPointer;
 
 class Rig : public QObject, public std::enable_shared_from_this<Rig> {
-
-    friend MyAvatar;
-
 public:
 
     struct HeadParameters {