Fix target dependencies for libtool in Bazel build files.

[cmtice]

Summary

A recent change to libtool makes it depend on llvm/Support/TargetSupport.h. This needs to be reflected in the bazel build file (which this change does).

[GMNGeoffrey]

utils/bazel/llvm-project-overlay/llvm/BUILD.bazel

204

This is already included in the glob above, which is why the pre-merge check is complaining about a duplicated header

[cmtice]

Never mind; someone beat me to the fix. Abandoning this.

utils/bazel/llvm-project-overlay/llvm/BUILD.bazel

]) + [
         "include/llvm-c/DisassemblerTypes.h",
         "include/llvm-c/Error.h",
         "include/llvm-c/ErrorHandling.h",
         "include/llvm-c/ExternC.h",
         "include/llvm-c/Support.h",
         "include/llvm-c/Types.h",
         "include/llvm/ExecutionEngine/JITSymbol.h",
         "include/llvm/Support/Extension.def",
+        "include/llvm/Support/TargetSelect.h",
         "include/llvm/Support/VCSRevision.h",
     ],
     copts = llvm_copts,
     includes = ["include"],
     linkopts = select({
         "@bazel_tools//src/conditions:windows": [],
         "@bazel_tools//src/conditions:freebsd": [
             "-pthread",