Update find command for cscope.

src/Makefile

@@ -7,4 +7,4 @@ tags: cscope.files
 	exctags -VL cscope.files
 
 cscope.files::
-	find build conio sbbs3 smblib uifc xpdev -name '*.c' -o -name '*.cpp' -o -name '*.h' > cscope.files
+	find build comio conio encode hash sbbs3 sexpots smblib syncdraw syncterm tone uifc xpdev -name '*.c' -o -name '*.cpp' -o -name '*.h' > cscope.files