Update license in src/libbsdl/src/parallel.h

Co-authored-by: Larry Gritz <lg@larrygritz.com>
Signed-off-by: Alejandro Conty <aconty@imageworks.com>

Author: aconty

src/libbsdl/src/parallel.h

@@ -1,3 +1,8 @@
+// Copyright Contributors to the Open Shading Language project.
+// SPDX-License-Identifier: BSD-3-Clause
+// https://github.com/AcademySoftwareFoundation/OpenShadingLanguage
+
+
 #pragma once
 
 #include <atomic>