[distcc] OS X fix

[Ben Hines]

Mac OS X needs to use the BSD ncpus code, or an error is generated:
distccd[11267]: (dcc_ncpus) ERROR: sysconf(_SC_NPROCESSORS_ONLN)  
failed: Undefined error: 0

Here is the patch (to 2.0.1):

--- src/ncpus.c.orig    2003-04-27 00:44:06.000000000 -0700
+++ src/ncpus.c 2003-04-27 00:44:14.000000000 -0700
@@ -64,7 +64,7 @@
  }


-#elif defined(__FreeBSD__) || defined(__OpenBSD__) ||  
defined(__NetBSD__)
+#elif defined(__FreeBSD__) || defined(__OpenBSD__) ||  
defined(__NetBSD__) || defined(__APPLE__)

  /*  
http://www.FreeBSD.org/cgi/ 
man.cgi?query=sysctl&sektion=3&manpath=FreeBSD+4.6-stable
      
http://www.openbsd.org/cgi-bin/ 
man.cgi?query=sysctl&sektion=3&manpath=OpenBSD+Current


Also, i started messing with zeroconf/rendezvous support. I already  
have distccd advertising - (username._distccd._tcp) It should be easy  
to get distcc finding servers, too, that's next.

-Ben