Separate build targets for aec3 and aec3_unittests

Bug: webrtc:8844
Change-Id: Id6a98eae19aaedc87c3f402a004f58f0290d5c28
Reviewed-on: https://webrtc-review.googlesource.com/56580
Commit-Queue: Gustaf Ullberg <gustaf@webrtc.org>
Reviewed-by: Alex Loiko <aleloi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22173}
diff --git a/test/fuzzers/BUILD.gn b/test/fuzzers/BUILD.gn
index fad746d..2d2d77c 100644
--- a/test/fuzzers/BUILD.gn
+++ b/test/fuzzers/BUILD.gn
@@ -445,6 +445,7 @@
     ":audio_processing_fuzzer_helper",
     ":fuzz_data_helper",
     "../../modules/audio_processing",
+    "../../modules/audio_processing/aec3",
     "../../rtc_base:rtc_base_approved",
   ]
 }