[patch] Update build flags for new compiler feature

[Dave Korn]

Dave Korn wrote:

>> Apparently.  There's no line containing __wrap__Znaj in config.log.
> 
>   Yeh, that proves I'm using the wrong sort of autoconf test.  

  No it doesn't!

>> While you're at it, there is another problem.  When building gcc-4.3.4
>> as cross, the auto-host.h file contains
>>
>>   #ifndef USED_FOR_TARGET
>>   /* #undef HAVE_GAS_ALIGNED_COMM */
>>   #endif
>>
>> afterwards.  That's quite unlucky, since options.c contains an
>> unconditional
>>
>>   int use_pe_aligned_common = HAVE_GAS_ALIGNED_COMM;
>>
>> So, right now I had to define HAVE_GAS_ALIGNED_COMM to 1 manually in
>> auto-host.h.

  Got it.  The cygport-generated diffs don't include patches to the generated
configure scripts, only the *.ac templates, so you need to manually reconf the
sources after applying the patch.  Check the cygport script for a list of
which directories need which auto* tool run on them (I haven't tried just
blindly autoreconf'ing the whole lot from top level but in theory that would
work too), and don't forget you need autoconf-2.59 and make-1.9.6.

    cheers,
      DaveK