fixed warning during compile about endian.c

src/endian.c

@@ -23,7 +23,7 @@
 
 static int endianness = UNKNOWN_ENDIAN;
 
-void init_endian() {
+void init_endian(void) {
     /* figure out what our endianness is! */
     short word = 0x0001;
     char* byte = (char*)(&word);

src/overviewer.h

@@ -79,7 +79,7 @@ PyObject *chunk_render(PyObject *self, PyObject *args);
 #include "rendermodes.h"
 
 /* in endian.c */
-void init_endian();
+void init_endian(void);
 unsigned short big_endian_ushort(unsigned short in);
 unsigned int big_endian_uint(unsigned int in);