libragephoto: fix build errors and some includes

- RagePhoto-Extract: include stdio.h
- RagePhotoC: include stddef.h instead of stdio.h
- RagePhotoTypedefs: include stddef.h

src/RagePhoto-Extract.c

@@ -17,6 +17,7 @@
 *****************************************************************************/
 
 #include "RagePhotoC.h"
+#include <stdio.h>
 
 int main(int argc, char *argv[])
 {

src/RagePhotoC.h

@@ -21,8 +21,8 @@
 
 #include "RagePhotoLibrary.h"
 #include "RagePhotoTypedefs.h"
+#include <stddef.h>
 #include <stdint.h>
-#include <stdio.h>
 
 #ifdef LIBRAGEPHOTO_C_NOAPI
 #error "libragephoto was built without C API"

src/RagePhotoTypedefs.h

@@ -19,6 +19,7 @@
 #ifndef RAGEPHOTOTYPEDEFS_H
 #define RAGEPHOTOTYPEDEFS_H
 
+#include <stddef.h>
 #include <stdint.h>
 
 #ifdef __cplusplus