fix compile errors on win32

vm/Config.windows

@@ -2,4 +2,4 @@ CFLAGS += -DWINDOWS
 LIBS = -lm
 PLAF_SUFFIX = .exe
 PLAF_OBJS = vm/os-windows.o
-include wm/Config.x86
+include vm/Config.x86

vm/cpu-x86.S

@@ -1,4 +1,4 @@
-#ifdef __APPLE__
+#if defined(__APPLE__) || defined(WINDOWS)
 	#define MANGLE(sym) _##sym
 #else
 	#define MANGLE(sym) sym

vm/os-windows.c

@@ -110,7 +110,6 @@ void primitive_read_dir(void)
 {
 	HANDLE dir;
 	WIN32_FIND_DATA find_data;
-	CELL result_count = 0;
 	char path[MAX_PATH + 4];
 
 	sprintf(path, "%s\\*", unbox_char_string());