Fix bad call to make in demo script
Applied svn r33 patch from master repo, however compute-accuracy is still segfaulting.

Comment from r33 log:
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r33 | tmikolov@google.com | 2013-08-22 23:03:07 -0700 (Thu, 22 Aug 2013) | 2 lines

bugfix - the vector computation was done before check for out-of-vocabulary words was performed, which resulted in accessing memory outside of the allocated block