Use the new licence header in ExtraTests's cpp files

tests/ExtraTests/X01-PrefixedMacros.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // X01-DisableStringification.cpp
 // Test that Catch's prefixed macros compile and run properly.
 // This won't provide full coverage, but it might be worth checking

tests/ExtraTests/X02-DisabledMacros.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // X02-DisabledMacros.cpp
 // Test that CATCH_CONFIG_DISABLE turns off TEST_CASE autoregistration
 // and expressions in assertion macros are not run.

tests/ExtraTests/X03-DisabledExceptions-DefaultHandler.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 #include <catch2/catch_test_macros.hpp>
 #include <catch2/benchmark/catch_benchmark.hpp>
 #include <catch2/matchers/catch_matchers.hpp>

tests/ExtraTests/X04-DisabledExceptions-CustomHandler.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 #include <catch2/catch_test_macros.hpp>
 
 namespace Catch {

tests/ExtraTests/X10-FallbackStringifier.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // X10-FallbackStringifier.cpp
 // Test that defining fallbackStringifier compiles
 

tests/ExtraTests/X11-DisableStringification.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // X11-DisableStringification.cpp
 // Test that stringification of original expression can be disabled
 // this is a workaround for VS 2017 issue with Raw String literal

tests/ExtraTests/X12-CustomDebugBreakMacro.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // X12-CustomDebugBreakMacro.cpp
 // Test that user-defined `CATCH_BREAK_INTO_DEBUGGER` is respected and used.
 

tests/ExtraTests/X90-WindowsHeaderInclusion.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 // X90-WindowsHeaderInclusion.cpp
 // Test that the Catch2 header compiles even after including windows.h
 // without defining NOMINMAX first. As an FYI, if you do that, you are

tests/ExtraTests/X91-AmalgamatedCatch.cpp

@@ -1,3 +1,11 @@
+
+//              Copyright Catch2 Authors
+// Distributed under the Boost Software License, Version 1.0.
+//   (See accompanying file LICENSE_1_0.txt or copy at
+//        https://www.boost.org/LICENSE_1_0.txt)
+
+// SPDX-License-Identifier: BSL-1.0
+
 /**\file
  *
  * This file serves as a simple compilation test against the amalgamated