Functions taking Mechanism take wrong input

[jsha]

These methods are defined by PKCS#11 to take a CK_MECHANISM_PTR, but their Go method signatures take a []*Mechanism. For clarity, I think they should take a single *Mechanism or possibly Mechanism.

func (c *Ctx) DecryptInit(sh SessionHandle, m []*Mechanism, o ObjectHandle) error
func (c *Ctx) DeriveKey(sh SessionHandle, m []*Mechanism, basekey ObjectHandle, a []*Attribute) (ObjectHandle, error)
func (c *Ctx) DigestInit(sh SessionHandle, m []*Mechanism) error
func (c *Ctx) EncryptInit(sh SessionHandle, m []*Mechanism, o ObjectHandle) error
func (c *Ctx) GenerateKey(sh SessionHandle, m []*Mechanism, temp []*Attribute) (ObjectHandle, error)
func (c *Ctx) GenerateKeyPair(sh SessionHandle, m []*Mechanism, public, private []*Attribute) (ObjectHandle, ObjectHandle, error)
func (c *Ctx) GetMechanismInfo(slotID uint, m []*Mechanism) (MechanismInfo, error)
func (c *Ctx) SignInit(sh SessionHandle, m []*Mechanism, o ObjectHandle) error
func (c *Ctx) SignRecoverInit(sh SessionHandle, m []*Mechanism, key ObjectHandle) error
func (c *Ctx) UnwrapKey(sh SessionHandle, m []*Mechanism, unwrappingkey ObjectHandle, wrappedkey []byte, a []*Attribute) (ObjectHandle, error)
func (c *Ctx) VerifyInit(sh SessionHandle, m []*Mechanism, key ObjectHandle) error
func (c *Ctx) VerifyRecoverInit(sh SessionHandle, m []*Mechanism, key ObjectHandle) error
func (c *Ctx) WrapKey(sh SessionHandle, m []*Mechanism, wrappingkey, key ObjectHandle) ([]byte, error)

I realize this is would be a breaking change, so feel free to say WONTFIX, but I wanted to point it out as a bit of a confusing thing in this package.