Add missing config.h to build failure with strict checking

Without the config, clang complains about conflicting types

reader-tr03119.c:138:5: error: conflicting types for 'escape_pace_input_to_buf'
int escape_pace_input_to_buf(sc_context_t *ctx,
    ^
./reader-tr03119.h:87:5: note: previous declaration is here
int escape_pace_input_to_buf(sc_context_t *ctx,
    ^

src/libopensc/reader-tr03119.c

@@ -18,6 +18,10 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
 #include "reader-tr03119.h"
 #include "ccid-types.h"
 #include "internal.h"