dlltool import library build optimization

[Ian Lance Taylor]

   Date: Wed, 22 Dec 1999 13:27:33 -0600 (CST)
   From: Mumit Khan <khan@NanoTech.Wisc.EDU>

   When building large DLLs, especially C++ ones, dlltool can take
   inordinately long time to and take the file system to its knees
   while it's creating those thousands of small files, one per
   symbol. For those who actually have to use a native windows
   machine, this can make it almost impossible to use dlltool to
   create import libraries with say 10k symbols thanks to all the
   files it needs to create first.

dlltool doesn't have to create any files at all.  That's a horrible
hack.  It should just build the BFD's in memory.

Ian