patch applied (ghc-6.8/ghc): Declare ctime_r on Mac OS

[Ian Lynagh]

Wed Sep  5 17:16:13 PDT 2007  Roman Leshchinskiy <rl at cse.unsw.edu.au>
  * Declare ctime_r on Mac OS
  
  On Mac OS, ctime_r is not declared in time.h if _POSIX_C_SOURCE is defined. We
  work around this by providing a declaration ourselves.
  

    M ./configure.ac +7
    M ./rts/RtsUtils.c +7