Remove leftover licenses for optional and string_view

After 175d3bb6 (MR !98), we don't bundle std::optional and
std::string_view, so no need to mention licenses of their reference
implementations.

diff --git a/COPYING b/COPYING
index f229f4bf71d07aacb097b9949a40ee842f5c1ecf..9d8e090edcdffb83bafab6952154194fd60c0d22 100644 (file)
--- a/COPYING
+++ b/COPYING
@@ -513,9 +513,7 @@ respective licenses:
 15. Guidelines Support Library (GSL)
 16. P0009 reference implementation (Sandia Corporation)
 17. pybind11
-18. Reference implementation of std::string_view
-19. Reference implementation of std::optional
-20. stl_interfaces
+18. stl_interfaces
 
 ============================================
 
@@ -1033,67 +1031,7 @@ Please also refer to the file CONTRIBUTING.md, which clarifies licensing of
 external contributions to this project including patches, pull requests, etc.
 --
 
-18. Reference implementation of std::string_view
-================================================
-
-Used with minor modifications from commit bf5824916b6895ccab0dbc2431520ee3b6d4f27f of
-https://github.com/martinmoene/string-view-lite.git, which is licensed as below.
-
-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.
-
-19. Reference implementation of std::optional
-=============================================
-
-Used with minor modifications from commit 096ce6d7e45ef184d of
-https://github.com/martinmoene/optional-lite.git, which is licensed as below.
-
-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.
-
-20. stl_interfaces
+18. stl_interfaces
 ==================
 
 Used with minor modification from commit 486db0a5543cea2901ed of