Fix RANGE ERROR STOPPED AT 8214

On a 48k Apple II, the BLTU2 call throws an error,
even when there is nothing to copy in the LC segment.

Add an alternative LC copy, based on memcpy, to an
extra file that the user can link in as with iobuf-0800.

This memcpy-based version allows our programs to run on
Integer ROM apple2. It costs 21 bytes in binary size,
plus memcpy (60 bytes in binary size + RAM use) if it
wasn't already linked in.

libsrc/apple2/lc-copy-applesoft.s

@@ -0,0 +1,9 @@
+;
+; Oliver Schmidt, 15.09.2009
+;
+; Copy the LC segment from the end of the binary to the Language Card
+; using AppleSoft's BLTU2 routine.
+;
+        .export         bltu2
+
+bltu2 := $D39A