Remove non-working Windows CE SEH code

vm/Config.windows.ce.arm

@@ -1,5 +1,4 @@
 CC = arm-wince-mingw32ce-gcc
 DLL_SUFFIX=-ce
 EXE_SUFFIX=-ce
-PLAF_DLL_OBJS += vm/os-windows-ce-arm.o
 include vm/Config.windows.ce vm/Config.arm

vm/os-windows-ce.c

@@ -37,7 +37,7 @@ char *getenv(char *name)
 	return 0; /* unreachable */
 }
 
-long exception_handler(PEXCEPTION_RECORD rec, void *frame, void *ctx, void *dispatch)
+void c_to_factor_toplevel(CELL quot)
 {
-	return 0;
+	c_to_factor(quot);
 }