[roll third_party/pigweed] pw_preprocessor: Do not check for __VA_OPT__ on older compilers

Do not check for __VA_OPT__ on compilers that are known to have
incomplete support for it.

Original-Bug: b/326135018
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/193434

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 975a59eafba5f87..ce288f125447b66
Roller-URL: https://ci.chromium.org/b/8755505736961648337
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I4d7366632524e381ff120e42eed07f0bfebcddcb
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/193327
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 975a59e..ce288f1 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 975a59eafba5f8796453560bac0265bce0c1b78a
+Subproject commit ce288f125447b66e14c085f7028082e905988e69