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.

libnfc/chips/pn53x.c

@@ -43,10 +43,6 @@
 #include "mirror-subr.h"
 #include "nfc-internal.h"
 
-#ifdef _WIN32
-#  include "contrib/windows.h"
-#endif
-
 #include <sys/param.h>
 
 #define CHIP_DATA(pnd) ((struct pn53x_data*)(pnd->chip_data))