Move fft to proper third_party directory

Bug: webrtc:8366
Change-Id: I741a381fe1cf18909baefd89743b2ff4fe0a6bae
Reviewed-on: https://webrtc-review.googlesource.com/86822
Reviewed-by: Niklas Enbom <niklas.enbom@webrtc.org>
Reviewed-by: Oskar Sundbom <ossu@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24091}
diff --git a/tools_webrtc/libs/generate_licenses.py b/tools_webrtc/libs/generate_licenses.py
index 66137f7..0281c40 100755
--- a/tools_webrtc/libs/generate_licenses.py
+++ b/tools_webrtc/libs/generate_licenses.py
@@ -49,6 +49,7 @@
     'zlib': ['third_party/zlib/LICENSE'],
     'base64': ['rtc_base/third_party/base64/LICENSE'],
     'portaudio': ['modules/third_party/portaudio/LICENSE'],
+    'fft': ['modules/third_party/fft/LICENSE'],
 
     # Compile time dependencies, no license needed:
     'yasm': [],