roll: third_party/pigweed third_party/freertos: Allow empty glob

In some versions of FreeRTOS used by internal teams, this glob may be
empty.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/263913
Original-Revision: 8165b25e5b05b5980a6a962596fa146c76d0c5df

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: a63dba9a3c7e7b..8165b25e5b05b5
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8720363636304348033
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I799284703a0ba6dacb086504ae9cb7a70ef08116
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/276027
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index a63dba9..8165b25 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a63dba9a3c7e7bd9c7cf079b5874ff61ddc81d49
+Subproject commit 8165b25e5b05b5980a6a962596fa146c76d0c5df