src/crypto/libcrypto.a and src/tls/libtls.a have circular references
and will need special handling with the linker at least for the time
being. This could be cleaned up eventually, but for now, provide a
mechanism to get the programs linked.
The new test-asn1 and test-x509 tools are built using libraries
from src/{utils,crypto,tls}. Currently, cross dependencies between
crypto and tls are still preventing the test-x509 from being linked
properly.