* shift libpkcs11 from src/pkcs11 to src/common as it is not used to implement the OpenSC PKCS#11 module
* invent a "libscdl" mini library that implements either libltdl based dynamic loading or uses native interfaces
* drop hard requirement for libltl to build OpenSC
* native Windows build does not need libltdl any more
* specify CNGSDK include dir to find cardmod.h. CNGSDK only registers with a handful of compilers
Deals with #323
git-svn-id: https://www.opensc-project.org/svnp/opensc/trunk@5201 c6295689-39f2-0310-b995-f0e70906c6a9