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/windows.h

@@ -27,11 +27,15 @@
 #define __WINDOWS_H__
 
 #  include <windows.h>
+#  include <winerror.h>
+#  include "win32/err.h"
 #  if defined (__MINGW32__)
 #    define snprintf(S, n, F, ...) sprintf(S, F, __VA_ARGS__)
 #    define MAX(a,b) max(a,b)
 #    define MIN(a,b) min(a,b)
 #    define pipe(fds) _pipe(fds, 5000, _O_BINARY)
+#    define ETIMEDOUT     WSAETIMEDOUT
+#    define ENOTSUP 134
 #  else
 #    define snprintf sprintf_s
 #    define strdup _strdup