Add PFFFT to generate_license

Bug: webrtc:9577
Change-Id: Id7169db3daf4615c35e7de60481c3d1f9fbb36ff
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/130511
Reviewed-by: Oleh Prypin <oprypin@webrtc.org>
Commit-Queue: Alessio Bazzica <alessiob@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27384}
diff --git a/tools_webrtc/libs/generate_licenses.py b/tools_webrtc/libs/generate_licenses.py
index 7665095..6a9d8a9 100755
--- a/tools_webrtc/libs/generate_licenses.py
+++ b/tools_webrtc/libs/generate_licenses.py
@@ -52,6 +52,7 @@
     'libvpx': ['third_party/libvpx/source/libvpx/LICENSE'],
     'libyuv': ['third_party/libyuv/LICENSE'],
     'opus': ['third_party/opus/src/COPYING'],
+    'pffft': ['third_party/pffft/LICENSE'],
     'protobuf': ['third_party/protobuf/LICENSE'],
     'rnnoise': ['third_party/rnnoise/COPYING'],
     'usrsctp': ['third_party/usrsctp/LICENSE'],