[roll third_party/pigweed] build: Apply -Wstrict-prototypes to C code

The -Wstrict-prototypes warning ensures C prototypes for functions
without parameters correctly use void.

Original-Fixed: 329
Original-Requires: pigweed-internal:10940
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/36241

third_party/pigweed Rolled-Commits: c2ce5245990b254..5a14a66ac5c66cf
Roller-URL: https://ci.chromium.org/b/8852373441905801040
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8852373441905801040
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I3eb7a3ebcf83aa9e8a85dfcf9e4b66c663a4a086
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/38624
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 c2ce524..5a14a66 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit c2ce5245990b254c9e67c15031c6b79f81388633
+Subproject commit 5a14a66ac5c66cfa11a043e439964c4651bd7c6e