dbghelp#25: break N was broken

[Eric Pouech]

the 'break 10' winedbg's command was (partially broken)
it did work when 10 was a line number in current function, but not when 
it was outside
this is mainly due to the fact that dbghelp.SymGetLine{Next/Prev} don't 
work across functions' boundaries

this patch implements dbghelp.SymEnumLines and re-implements the 'break 
10' command on top of it

A+
-- 
Eric Pouech
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