configure.ac: Update dependency from gsl 1.12 to 1.13 20131227030514/pspp 20131228030519/pspp 20131229030513/pspp
authorJohn Darrington <john@darrington.wattle.id.au>
Thu, 26 Dec 2013 20:10:03 +0000 (21:10 +0100)
committerJohn Darrington <john@darrington.wattle.id.au>
Thu, 26 Dec 2013 20:10:03 +0000 (21:10 +0100)
Until version 1.13 gsl_matrix_free would crash when passed NULL.

Reported-by: Frans Houweling <fhouweling@email.it>

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