Merge from vendor branch TNF:

Merge from vendor branch TNF:
Initial import of security/libpbc-0.5.10 into the Packages Collection.

	The PBC (Pairing-Based Cryptography) library is a free C library built
	on the GMP library that performs the mathematical operations
	underlying pairing-based cryptosystems.

	It provides routines such as elliptic curve generation, elliptic curve
	arithmetic and pairing computation.

	The API is abstract enough that the PBC library can be used even if
	the programmer possesses only an elementary understanding of pairings.
	There is no need to learn about elliptic curves or much of number
	theory.  (The minimum requirement is some knowledge of cyclic groups
	and properties of the pairing.)

	      Boneh-Lynn-Shacham short signatures
	      Hess identity-based signatures
	      Joux tripartite Diffie-Hellman
	      Paterson identity-based signatures
	      Yuan-Li identity-based authenticated key agreement
	      Zhang-Kim identity-based blind/ring signatures
	      Zhang-Safavi-Naini-Susilo signatures