Patch: Only use strict COFF for djgpp

[Mark E.]

> Mark, perhaps prematurely, had concluded that it helped to cure some
> problems that crept in with binutils-2.10, compared to earlier version.  
> It looks as if we're curing symptoms, once more, instead of the disease.

Naturally, I'll have to disagree with this. The change eliminated a 
difference between the two versions of obj_coff_endef that caused problems 
with DJGPP. I remain convinced that this change or at least H.J.'s is the 
cure. But I can also live with whatever solution Nick approves that still 
solves the 'no section' problem.

Mark