Make Optlink not create a .map file

[torhu]

Optlink seems to always output a .map file.  From the docs, I can't see 
any way to avoid this.  Just making it ouput the .map file in the same 
dir where it outputs the .objs and .exes would help a bit.

I'm creating a makefile for DM make, so I don't have an easy way to get 
the filename of the .map file, so I can't easily delete it that way 
either.  Doing 'del *.map' isn't a great solution.