stable test failures

[Simon Marlow]

It seems the PPC OSX buildbot is failing all its -fvia-C tests, with the 
error below.  We ought to look into this before the 6.8.3 release. 
Thorkil, can you shed any light?

Cheers,
	Simon

====> arr001(optc)
cd ./array/should_run && 
'/Users/thorkilnaur/tn/buildbot/ghc/tnaur-ppc-osx/tnaur-ppc-osx-stable/build/compiler/stage2/ghc-inplace' 
-no-recomp -dcore-lint -dcmm-lint -Dpowerpc_apple_darwin  -o arr001 
arr001.hs -O -fvia-C   >arr001.comp.stderr 2>&1
Compile failed (status 256) errors were:

In file included from /tmp/ghc4263_0/ghc4263_0.hc:4:0:
/Users/thorkilnaur/tn/buildbot/ghc/tnaur-ppc-osx/tnaur-ppc-osx-stable/build/libraries/base/include/HsBase.h: 
In function 'getUSecOfDay':

/Users/thorkilnaur/tn/buildbot/ghc/tnaur-ppc-osx/tnaur-ppc-osx-stable/build/libraries/base/include/HsBase.h:726:0:
      warning: passing argument 2 of 'gettimeofday' from incompatible 
pointer type

In file included from /tmp/ghc4263_0/ghc4263_0.hc:8:0:
/Users/thorkilnaur/tn/buildbot/ghc/tnaur-ppc-osx/tnaur-ppc-osx-stable/build/libraries/unix/include/HsUnix.h: 
In function '__hsunix_rtldNext':

/Users/thorkilnaur/tn/buildbot/ghc/tnaur-ppc-osx/tnaur-ppc-osx-stable/build/libraries/unix/include/HsUnix.h:111:0:
      error: 'RTLD_NEXT' undeclared (first use in this function)

/Users/thorkilnaur/tn/buildbot/ghc/tnaur-ppc-osx/tnaur-ppc-osx-stable/build/libraries/unix/include/HsUnix.h:111:0:
      error: (Each undeclared identifier is reported only once

/Users/thorkilnaur/tn/buildbot/ghc/tnaur-ppc-osx/tnaur-ppc-osx-stable/build/libraries/unix/include/HsUnix.h:111:0:
      error: for each function it appears in.)
/Users/thorkilnaur/tn/buildbot/ghc/tnaur-ppc-osx/tnaur-ppc-osx-stable/build/libraries/unix/include/HsUnix.h: 
In function '__hsunix_rtldDefault':

/Users/thorkilnaur/tn/buildbot/ghc/tnaur-ppc-osx/tnaur-ppc-osx-stable/build/libraries/unix/include/HsUnix.h:115:0:
      error: 'RTLD_DEFAULT' undeclared (first use in this function)