Remove eventdns specific inline definition

The header includes compat.h which already defines inline.

src/or/eventdns_tor.h

@@ -12,9 +12,6 @@ typedef unsigned int uint;
 #ifndef HAVE_U_CHAR
 typedef unsigned char u_char;
 #endif
-#ifdef _WIN32
-#define inline __inline
-#endif
 #include "torint.h"
 
 /* These are for debugging possible memory leaks. */