Make compiler_stage2_dll0_MODULES multi-line

[Dr. ERDI Gergo]

Hi,

Currently, compiler_stage2_dll0_MODULES is defined on a single line in 
compiler/ghc.mk. This means at least on git, any two changes to it on 
separate branches results in a merge conflict (I don't know if darcs 
handles same-line changes better). Is there any reason we don't 
change it to multiple lines (with escaped trailing newlines) so that git 
can merge changes?

Bye,
 	Gergo

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