adjusted license header according to COPYING.md

Author: Butzlaff

src/check_asm.sh

@@ -2,19 +2,8 @@
 
 # Copyright (C) 2004-2011 Erik de Castro Lopo <erikd@mega-nerd.com>
 #
-# This program is free software; you can redistribute it and/or modify
-# it under the terms of the GNU General Public License as published by
-# the Free Software Foundation; either version 2 of the License, or
-# (at your option) any later version.
-#
-# This program is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
+# This code is released under 2-clause BSD license. Please see the
+# file at : https://github.com/libsndfile/libsamplerate/blob/master/COPYING
 
 #=======================================================================
 # This short test script compiles the file src_sinc.c into assembler