[project @ 1999-04-27 09:37:04 by simonm]

- Don't add -DCOMPILING_RTS twice

- *set* SRC_CC_OPTS rather than appending to it: we're using ghc as
  the C compiler, so normal gcc flags probably won't work.  eg. if
  you put SRC_CC_OPTS += -g in your build.mk, it'll fall over here.