Remove now superfluous license file pattern

[skip ci]

(manually cherry picked from commit af205124)

license.txt

@@ -337,11 +337,6 @@ Copyright: 2009 John Burkardt
            2010-2017 Dynare Team
 License: LGPL-3+
 
-Files: macOS/brewfiles/*
-Copyright: 2009-2019 Homebrew contributors
-           2019-2021 Dynare Team
-License: BSD-2-clause
-
 Files: preprocessor/m4/ax_boost_base.m4
 Copyright: 2008-2009 Thomas Porschberg <thomas@randspringer.de>
            2009 Peter Adolphs