[roll] Roll fuchsia [libc] Complete soft migration of files to /strings

This removes the exec script and old location targets for files that
were moved to /strings.

This is blocked on the merging of llvm/llvm-project#119623
into Fuchsia.

Original-Fixed: 383347626
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1172249
Original-Revision: 7447daf875ce2e8677cf86ce31f879c71806b76f
GitOrigin-RevId: 986d20c7fc3df983144976fc7839c42a2642841c
Change-Id: I28171b62ff1a16f68c4a36c90c7de8e3c25ce082

Author: Caslyn Tonelli

stem

@@ -11,7 +11,7 @@
              githooks="integration/git-hooks"
              remote="https://fuchsia.googlesource.com/fuchsia"
              gerrithost="https://fuchsia-review.googlesource.com"
-             revision="57d329387c61837cd5dcf7023675dc7a26b643cb"/>
+             revision="7447daf875ce2e8677cf86ce31f879c71806b76f"/>
   </projects>
   <hooks>
     <hook name="install-environment"