Make it easier to specify in/out files for neteq_quality_test.

Bug: b/251155608
Change-Id: I174351d76a83de651f5ef025606712333a83cf52
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/278786
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#38358}
diff --git a/modules/audio_coding/BUILD.gn b/modules/audio_coding/BUILD.gn
index b5c4507..0d67cfa 100644
--- a/modules/audio_coding/BUILD.gn
+++ b/modules/audio_coding/BUILD.gn
@@ -1699,6 +1699,7 @@
         "../../api/audio_codecs:builtin_audio_decoder_factory",
         "../../api/neteq:neteq_api",
         "../../rtc_base:checks",
+        "../../rtc_base:stringutils",
         "../../system_wrappers",
         "../../test:fileutils",
         "../../test:test_support",