libcrypto: rsa gen: min. distance between p and q

This is required in NIST Special Publication 800-56B Revision 2
"Recommendation for Pair-Wise Key Establishment Using Integer
Factorization Cryptography":

 6 RSA Key Pairs
 6.2 Criteria for RSA Key Pairs for Key Establishment
 6.2.1 Definition of a Key Pair

	3. The prime factors p and q shall be generated using one of
	   the methods specified in Appendix B.3 of FIPS 186 such that:

		c. |p – q| > 2nBits/2−100

ok djm@, tb@

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