ccid-emulator: Build libopensc from source code

There is no longer an external (or stable) interface for libopensc.
Linking this program with an existing version of libopensc that is
pre-installed in the system library paths is not practical.

However, a specific snapshot of the OpenSC source code is embedded
here as a Git submodule (and included in the source distributions).
Build libopensc from this and statically link it into this program.
(Options such as '--enable-openpace' that are passed to ./configure
will be forwarded to control the build configuration of libopensc.)

Remove code that existed for compatibility when dynamically linking
with older versions of libopensc.

ccid/src/ccid.h

@@ -23,8 +23,7 @@
 #define _CCID_H
 
 #include <linux/usb/ch9.h>
-#include <libopensc/opensc.h>
-#include "ccid-types.h"
+#include <libopensc/ccid-types.h>
 
 #ifdef __cplusplus
 extern "C" {