Make the separation between target and interferer scenario depend on microphone spacing in Nonlinea…

webrtc/modules/audio_processing/beamformer/array_util.h

Index: webrtc/modules/audio_processing/beamformer/array_util.h
diff --git a/webrtc/modules/audio_processing/beamformer/array_util.h b/webrtc/modules/audio_processing/beamformer/array_util.h
index f7598c0b5d2f7268c95a771ef65e52ce7d63d7c6..2ac174ea8aa04800995551d03017c9d215415921 100644
--- a/webrtc/modules/audio_processing/beamformer/array_util.h
+++ b/webrtc/modules/audio_processing/beamformer/array_util.h
@@ -12,6 +12,7 @@
 #define WEBRTC_MODULES_AUDIO_PROCESSING_BEAMFORMER_ARRAY_UTIL_H_
 
 #include <cmath>
+#include <vector>
 
 namespace webrtc {
 
@@ -31,6 +32,10 @@ struct CartesianPoint {
 
 using Point = CartesianPoint<float>;
 
+// Returns the minimum distance between any two Points in the given
+// |array_geometry|.
+float GetMinimumSpacing(const std::vector<Point>& array_geometry);
+
 template<typename T>
 float Distance(CartesianPoint<T> a, CartesianPoint<T> b) {
   return std::sqrt((a.x() - b.x()) * (a.x() - b.x()) +