Rewrite/fix cygwin1.dbg generation

[Pedro Alves]

Christopher Faylor wrote:

> If that is the case, then this is a welcome change but I'm wondering if
> it really is true.  Since the debug stripping is linked to the way that
> cygwin manages the cygwin heap, it is possible that things only appear
> to work until you allocate more space in the heap.  Has anyone tried the
> above with a program that, say, opens a lot of file handles?
> 

I wrote:
 >Ah, got it.  VirtualAlloc fails on the first _csbrk, since it
 >is tripping on the VMA of .gnu_debuglink ...  I assumed it would
 >not be a problem, since it isn't ALLOCced, but oh well...
 >I tried adding an EXCLUDE/NOLOAD flag to .gnu_debuglink, but no
 >can do.

"on the first _csbrk that tries to grow the heap,"

Cheers,
Pedro Alves