Windows support contribution:

- Move CMake modules from cmake_modules/ to cmake/modules/
 - CMake now use cmake/config_windows.h.cmake to create config.h on Windows platform
 - contrib/windows.h header is automagically included by config.h
 - Put missing NFC_EXPORT macro on front of emulation API
 - nfc-mfclassic and nfc-mfcultralight examples are now compiled under Windows
Many thanks to Glenn Ergeerts which provide the initial patch.

contrib/win32/err.h

@@ -14,6 +14,6 @@
 	exit (code); \
 } while (0)
 
-#define err(code, ...) errx(code, ...)
+#define err errx
 
 #endif /* !_ERR_H_ */