roll: pigweed pw_thread: Delete unused constructor implementations

Remove implementations of the deprecated function pointer constructor,
which is private and unused.

Original-Bug: b/367786892
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/236892
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: 39f64a722bd24730d936d9360f232a90d699f8a3

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 30bdace4866039..39f64a722bd247
Roller-URL: https://ci.chromium.org/b/8735266658009290129
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I845499c40c221499a9c0efdd98bf073d31390387
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/239092
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/MODULE.bazel b/MODULE.bazel
index 36de119..ba86c41 100644
--- a/MODULE.bazel
+++ b/MODULE.bazel
@@ -49,8 +49,8 @@
     module_name = "pigweed",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-10-01.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8735313087074342593.
-    commit = "30bdace4866039e26a05f8baa379630e066ad660",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8735266658009290129.
+    commit = "39f64a722bd24730d936d9360f232a90d699f8a3",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
 )
 
@@ -58,8 +58,8 @@
     module_name = "pw_toolchain",
     # ROLL: Warning: this entry is automatically updated.
     # ROLL: Last updated 2024-10-01.
-    # ROLL: By https://cr-buildbucket.appspot.com/build/8735313087074342593.
-    commit = "30bdace4866039e26a05f8baa379630e066ad660",
+    # ROLL: By https://cr-buildbucket.appspot.com/build/8735266658009290129.
+    commit = "39f64a722bd24730d936d9360f232a90d699f8a3",
     remote = "https://pigweed.googlesource.com/pigweed/pigweed",
     strip_prefix = "pw_toolchain_bazel",
 )