Conversion between void * and function pointer.
Value computed not used.
Signed/unsigned argument.

version some time soon.

Submitted by: Huang Ying
Reviewed by: Douglas Stebila

than referencing existing X509_NAME_ENTRY structures so needs to be
completely freed.

CryptUIDlgSelectCertificateFromStore() at runtime. Add callback function
for selection mechanism.

CryptoAPI ENGINE.

Add appropriate #ifdefs round client cert functions in headers.