[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.
diff --git a/libcxx/src/string.cpp b/libcxx/src/string.cpp
index c8dae34..608dcb2 100644
--- a/libcxx/src/string.cpp
+++ b/libcxx/src/string.cpp
@@ -1,4 +1,4 @@
-//===------------------------- string.cpp ---------------------------------===//
+//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
