[PTR-PLUS] Fix one more C++ testcase by removing dead code (also status)

[Andrew_Pinski at PlayStation dot Sony dot Com]

Hi,
  The problem here is that we used to allow incrementing casts expression 
by the extended lvalue rules but we now don't allow this.  We now always 
get an error but the wrong one, as there is no assignment in there. Though 
this testcase (g++.old-deja/g++.mike/warn1.C) fails on the pointer plus 
branch because we are trying to build a PLUS_EXPR for pointer types which 
is wrong.  Now this code is dead, I am removing it from the branch and 
will be submitting the same patch for the mainline but later on after a 
bootstrap/test there.

This brings us down to one testsuite failure in the C++ testsuite which I 
think was a latent bug in expand. None in the libstdc++ testsuite.  There 
are more failures in libgomp for C++.  SCEV still needs to be fixed up 
too. I have not looked at yet, the Ada, Java, or Fortran front-ends.

Committed after a build/test on i686-linux-gnu with no regressions.

Thanks,
Andrew Pinski

ChangeLog:

        * typeck.c (build_unary_op): Remove code that used to
        handle non lvalue increments/decrements as we now error
        out all ways.

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