[third_party/pigweed] Roll 12 commits

ce288f125447b66 pw_preprocessor: Do not check for __VA_OPT__ on ol
975a59eafba5f87 docs: Fix canonical URLs for all */docs.html pages
4d84f9fc0269f12 roll: clang
7e49f0b7f5e47ac roll: clang-next
b83c8ed0ce86ff9 pw_transfer: Fix integration test START packet iss
36b6a7ddb0c28b6 pw_json: Classes for serializing JSON
1ac49bcda648d72 pw_software_update: Add java build objects
fc92d636edcc491 pw_toolchain: Add missing #include
a438bf7f3271870 pw_preprocessor: Switch to Doxygen
8e87382862fa9df pw_preprocessor: Use __VA_OPT__ when available
68f37cc76f34908 pw_ide: Fix environment inference
5f27e8171fe5207 pw_package: Update GoogleTest

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: a2b21f201273691..ce288f125447b66
Roller-URL: https://ci.chromium.org/b/8755493498183048833
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I0803351fcc81e04a4bd899c8af93bd8d17a73129
Reviewed-on: https://pigweed-review.googlesource.com/c/gonk/+/193381
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.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 a2b21f2..ce288f1 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit a2b21f20127369137c0a24ba1aa91dba86ce9197
+Subproject commit ce288f125447b66e14c085f7028082e905988e69