Review Request: Allow to pass multiple targets and build variables to the make builder

[Wolfgang Bangerth]

>         These are variables, not no targets - their order do not matter,

They do if you happen to set the same variable twice:
   make X=abc X=def
will produce different results than
   make X=def X=abc
That might be poor style, but it would be surprising to type it in this 
order just to find out that Kdevelop reorders it in a way that you can't 
change.

Best
  W.

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Wolfgang Bangerth               email:            bangerth at math.tamu.edu
                                 www: http://www.math.tamu.edu/~bangerth/