GN build rules for four audio processing test executables
GN build rules for four audio processing test executables

click_annotate, intelligibility_proc, nonlinear_beamformer_test, and
transient_suppression_test.

This is a re-land of https://codereview.webrtc.org/2267403003

BUG=webrtc:5949

Review-Url: https://codereview.webrtc.org/2273783004
Cr-Original-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#13913}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 7a770e0a61cb9bf823691e5858b13ef3319ee69a

Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk,Alkalyne/webrtctrunk