Switch neteq_rtpplay into an executable.

Bug: None
Change-Id: Iecfe4f59336081583850ebcef9e115821a3f27f7
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/146715
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Oleh Prypin <oprypin@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28677}

modules/audio_coding/BUILD.gn

@@ -1488,7 +1488,7 @@ if (rtc_include_tests) {
       ]
     }
 
-    rtc_test("neteq_rtpplay") {
+    rtc_executable("neteq_rtpplay") {
       testonly = true
       visibility += [ "*" ]
       defines = []