minor patch for g++ testsuite

[Jeffrey A Law]

  In message < or7mbp42ze.fsf@sunsite.dcc.unicamp.br >you write:
  > Jason Merrill has pointed out in private that <std.h> had not been
  > renamed, it is just part of libg++, and the <std> filename I had found
  > was actually a directory (*blush*)
  > 
  > In fact, the test seems not to require <std.h> to be included, but it
  > may have required that in order to crash previously.
  > 
  > Here's a patch (that assumes the previous wrong patch was applied)
These things happen.  Oh well.

I just deleted the include.

jeff