[patch boehm-gc]: Add definition of GC_BUILD for mingw targets

[Andrew Haley]

On 07/16/2009 12:03 PM, Kai Tietz wrote:
> Hello,
> 
> I noticed that for boehm-gc the definition of GC_BUILD isn't defined
> for mingw targets. This patch adds to configure.ac the rule for it. Is
> this patch ok for mainline, and possible for branches, too?

Sure.  Please forward upstream, too.  I need to do a merge with upstream.

Andrew.