path so that ERR_load_strings() is found in certain circumstances
involving dlopen(). eg: main program dlopened foo.so which is linked
against libcrypto. If libcrypto then dlopens librsaUSA.so, then it's
search path doens't find libcrypto (!). One "fix" is to force
modules (eg main opening foo.so) to use the RTLD_GLOBAL flag, the other
is to explicitly declare dependencies (as done here).
Reorganize and unify libcrypto's interface so that the RSA implementation
is chosen at runtime via dlopen().
This is a checkpoint and may require more tweaks still.
