add license text to script file

scripts/build-android-libs.sh

@@ -1,4 +1,24 @@
 #!/bin/bash
+#
+# HEIF codec.
+# Copyright (c) 2023 Dirk Farin <[email protected]>
+#
+# This file is part of libheif.
+#
+# libheif 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 3 of the License, or
+# (at your option) any later version.
+#
+# libheif 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 libheif.  If not, see <http://www.gnu.org/licenses/>.
+#
+
 
 # This script builds binaries for all Android architectures. They are placed in the directory 'out'.
 # The libheif source has to be unpacked to a directory named "libheif-1.16.2" (replace version number with the value of HEIF_VERSION below).