[boost] [range] partial_workaround test

From: Stefan Slapeta (stefan_at_[hidden])
Date: 2005-12-16 04:54:57

I remember that we agreed not to fail workaround tests for compiler that 
   don't need this particular workaround but to generally let them 
return a positive result instead.

Thus, I suggest to change partial_workaround in boost.range to behave 
this way.

Stefan