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/scutil.h

@@ -88,38 +88,5 @@ void _bin_log(sc_context_t *ctx, int type, const char *file, int line,
  */
 int print_avail(int verbose);
 
-/*
- * OPENSC functions that do not get exported (sometimes)
- */
-
-/**
- * Returns the encoded APDU in newly created buffer.
- * @param  ctx     sc_context_t object
- * @param  apdu    sc_apdu_t object with the APDU to encode
- * @param  buf     pointer to the newly allocated buffer
- * @param  len     length of the encoded APDU
- * @param  proto   protocol to be used
- * @return SC_SUCCESS on success and an error code otherwise
- */
-int sc_apdu_get_octets(sc_context_t *ctx, const sc_apdu_t *apdu, u8 **buf,
-	size_t *len, unsigned int proto);
-
-/**
- * Sets the status bytes and return data in the APDU
- * @param  ctx     sc_context_t object
- * @param  apdu    the apdu to which the data should be written
- * @param  buf     returned data
- * @param  len     length of the returned data
- * @return SC_SUCCESS on success and an error code otherwise
- */
-int sc_apdu_set_resp(sc_context_t *ctx, sc_apdu_t *apdu, const u8 *buf,
-	size_t len);
-
-/* Returns an index number if a match was found, -1 otherwise. table has to
- * be null terminated. */
-int _sc_match_atr(struct sc_card *card, struct sc_atr_table *table, int *type_out);
-
-int fread_to_eof(const char *file, unsigned char **buf, size_t *buflen);
-
 #endif
 /* @} */