Missing copyright statements and Boost license text for files forked from SLEEF, fixes #6202

licenses/sleef_LICENSE.txt

@@ -0,0 +1,30 @@
+=============================================================================
+Boost Software License - Version 1.0
+
+This license applies to selected portions of the software derived from SLEEF
+(https://sleef.org/), as noted in the applicable source file headers.
+=============================================================================
+
+Boost Software License - Version 1.0 - August 17th, 2003
+
+Permission is hereby granted, free of charge, to any person or organization
+obtaining a copy of the software and accompanying documentation covered by
+this license (the "Software") to use, reproduce, display, distribute,
+execute, and transmit the Software, and to prepare derivative works of the
+Software, and to permit third-parties to whom the Software is furnished to
+do so, all subject to the following:
+
+The copyright notices in the Software and this entire statement, including
+the above license grant, this restriction and the following disclaimer,
+must be included in all copies of the Software, in whole or in part, and
+all derivative works of the Software, unless such copies or derivative
+works are solely in the form of machine-executable object code generated by
+a source language processor.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
+SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
+FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

rtengine/helperavx.h

@@ -3,6 +3,11 @@
 //  this code was taken from http://shibatch.sourceforge.net/
 //  Many thanks to the author: Naoki Shibata
 //
+//   Copyright Naoki Shibata and contributors 2010 - 2021.
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file sleef_LICENSE.txt or copy at
+//          http://www.boost.org/LICENSE_1_0.txt)
+//
 ////////////////////////////////////////////////////////////////
 #ifndef __AVX__
 #error Please specify -mavx.

rtengine/helpersse2.h

@@ -3,6 +3,11 @@
 //  this code was taken from http://shibatch.sourceforge.net/
 //  Many thanks to the author of original version: Naoki Shibata
 //
+//   Copyright Naoki Shibata and contributors 2010 - 2021.
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file sleef_LICENSE.txt or copy at
+//          http://www.boost.org/LICENSE_1_0.txt)
+//
 //  This version contains modifications made by Ingo Weyrich
 //
 ////////////////////////////////////////////////////////////////

rtengine/sleef.h

@@ -3,6 +3,11 @@
 //  this code was taken from http://shibatch.sourceforge.net/
 //  Many thanks to the author of original version: Naoki Shibata
 //
+//   Copyright Naoki Shibata and contributors 2010 - 2021.
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file sleef_LICENSE.txt or copy at
+//          http://www.boost.org/LICENSE_1_0.txt)
+//
 //  This version contains modifications made by Ingo Weyrich
 //
 ////////////////////////////////////////////////////////////////

rtengine/sleefsseavx.h

@@ -3,6 +3,11 @@
 //  this code was taken from http://shibatch.sourceforge.net/
 //  Many thanks to the author of original version: Naoki Shibata
 //
+//   Copyright Naoki Shibata and contributors 2010 - 2021.
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file sleef_LICENSE.txt or copy at
+//          http://www.boost.org/LICENSE_1_0.txt)
+//
 //  This version contains modifications made by Ingo Weyrich
 //
 ////////////////////////////////////////////////////////////////