roll: pigweed, pw_toolchain: pw_toolchain: Expose a symlink to clangd

Running,

    bazelisk build //pw_toolchain/host_clang:copy_clangd

creates a symlink to clangd at bazel-bin/pw_toolchain/host_clang/clangd.

Original-Bug: 355655415
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/226262
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
pigweed, pw_toolchain Rolled-Commits: 88f05c77b478b16..7bbbec8a98bcf12
Roller-URL: https://ci.chromium.org/b/8741049260777105265
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I85c244b5fe7f58fab3244dc303f8df8c2cb6c731
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/226264
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/WORKSPACE b/WORKSPACE
index f61ebef..ed7e233 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -83,18 +83,18 @@
 git_repository(
     name = "pigweed",
     # ROLL: Warning: this entry is automatically updated.
-    # ROLL: Last updated 2024-07-27.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8741236835871158401.
-    commit = "88f05c77b478b1630c935e13f4bc7bcceaad8c22",
+    # ROLL: Last updated 2024-07-29.
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8741049260777105265.
+    commit = "7bbbec8a98bcf129872da475b0a46a5a96f09916",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed.git",
 )
 
 git_repository(
     name = "pw_toolchain",
     # ROLL: Warning: this entry is automatically updated.
-    # ROLL: Last updated 2024-07-27.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8741236835871158401.
-    commit = "88f05c77b478b1630c935e13f4bc7bcceaad8c22",
+    # ROLL: Last updated 2024-07-29.
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8741049260777105265.
+    commit = "7bbbec8a98bcf129872da475b0a46a5a96f09916",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed.git",
     strip_prefix = "pw_toolchain_bazel",
 )