[roll third_party/pigweed] 3p/freertos: disable statics to link against kernel internals

Modifies the build files for FreeRTOS to redefine static as nothing,
which permits us to link against internal data structures such as
TCB lists inside of Source/tasks.c.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/53342

third_party/pigweed Rolled-Commits: 3c52fd35b6e7a1d..86b10e1802a6ed1
Roller-URL: https://ci.chromium.org/b/8841081937718071008
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8841081937718071008
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ic58cd7beda52da165c64a1baea876b689c4955ca
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/53865
Reviewed-by: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 3c52fd3..86b10e1 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 3c52fd35b6e7a1d762ba5706045bf40581a36ed0
+Subproject commit 86b10e1802a6ed1aa806c61db5139949b16b8949