BRUN becomes RUN - minor bug though

[lyricalnanoha <lyricalnanoha@usotsuki.hoshinet.org>]

I wrote this little ca65 program in order to be able to wrap a BASIC 
program into a binary, to make it easier to pack stuff into single files.

It's got a minor bug, possibly because I don't yet understand fpbasic's 
internals well enough: it only does the RUN correctly if executed from a 
running program (the one I tested was Key-Cat).

          .org      $0800
          jmp       relocate
          .incbin   "mybas.fp", $0002
xtrabyte: .incbin   "mybas.fp", $0000, $0002
relocate: lda       xtrabyte
          sta       $0801
          lda       xtrabyte+1
          sta       $0802
          lda       #<xtrabyte
          sta       $AF
          lda       #>xtrabyte
          sta       $B0
          lda       #$00
          sta       $0800
          jmp       $D912

So I'm guessing $D912 is the wrong address... Otherwise, it works great 
and I might try using it to wrap some stuff into a single file (following 
which I'll wrap it *again* to make it a BAS file again... lol)

BTW, I'm planning to do this with DLM stuff, but if anyone's got stuff 
that isn't "hacktro'd" I'd like to take a shot at that too xD, esp. now 
that I've learned how to use stuff like Advanced Demuffin. (Now I'm 
wishing my real //e had the EDM!)

-uso.