patch applied (ghc): add ' const' modifiers to types where appropriate

[Simon Marlow]

Wed Jun  7 07:58:00 PDT 2006  Simon Marlow <simonmar at microsoft.com>
  * add 'const' modifiers to types where appropriate

    M ./includes/Rts.h -1 +1
    M ./includes/RtsMessages.h -8 +8
    M ./rts/RtsMessages.c -10 +10