[roll third_party/pigweed] pw_build: Check the library type in pw_add_library CMake function

This is helpful in case the user forgets to specify the library type,
since it is not required for the built-in add_library function.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/112213

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 3bfceac6441a13b..30679ca7972aafd
Roller-URL: https://ci.chromium.org/b/8801744058416771441
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ib7271b1ca623c19beaa66a230235df9c64612bee
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/112490
Bot-Commit: 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 3bfceac..30679ca 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 3bfceac6441a13bebd7c2de6017ffc5a04807e44
+Subproject commit 30679ca7972aafdcea46e20a32fc77b2fa2682d1