Fix reading of speedfan shared memory area on win64, make the "handle" field a 32bit signed integer instead of a void pointer (whose length differs depending on the arch gkrellm was built for)

src/sysdeps/win32.c

@@ -760,7 +760,7 @@ typedef struct _SFSharedMemory
 	unsigned short int version;
 	unsigned short int flags;
 	signed int         MemSize;
-	HANDLE             handle;
+	signed int         handle;
 	unsigned short int NumTemps;
 	unsigned short int NumFans;
 	unsigned short int NumVolts;