[runtimes][NFC] Remove filenames at the top of the license notice

We've stopped doing it in libc++ for a while now because these names
would end up rotting as we move things around and copy/paste stuff.
This cleans up all the existing files so as to stop the spreading
as people copy-paste headers around.

GitOrigin-RevId: eb8650a75793b2bd079d0c8901ff066f129061da
28 files changed
tree: 17d00a0855fddcd40777d86a1c8e8b5430153ab2
  1. cmake/
  2. docs/
  3. include/
  4. src/
  5. test/
  6. .clang-format
  7. CMakeLists.txt