libkeyfinder: avoid ambiguous pow(3)

audio/libkeyfinder/distinfo

@@ -1,5 +1,6 @@
-$NetBSD: distinfo,v 1.1 2021/11/20 18:09:45 nia Exp $
+$NetBSD: distinfo,v 1.2 2022/04/25 13:49:49 tnn Exp $
 
 BLAKE2s (libkeyfinder-2.2.5.tar.gz) = 37abe2a1057e320df231cbfcceb0bd39fe8b58f12e1ce5a21cd962e3df5dc611
 SHA512 (libkeyfinder-2.2.5.tar.gz) = 54463d1f1111dc474d3e43723fddd5579ea1a3842f99f43e50e85622a1d6ee6fe42b22c300ce5ba5807cf6b2d7067af741773af95974a42c5d863c53165893eb
 Size (libkeyfinder-2.2.5.tar.gz) = 79220 bytes
+SHA1 (patch-src_windowfunctions.cpp) = f3eb1a4bd739fa41e56aecddde1ce85a745df5a6

audio/libkeyfinder/patches/patch-src_windowfunctions.cpp

@@ -0,0 +1,15 @@
+$NetBSD: patch-src_windowfunctions.cpp,v 1.1 2022/04/25 13:49:49 tnn Exp $
+
+Explicitly use std::pow, avoids ambiguous reference on SunOS.
+
+--- src/windowfunctions.cpp.orig	2021-07-17 22:04:12.000000000 +0000
++++ src/windowfunctions.cpp
+@@ -21,6 +21,8 @@
+ 
+ #include "windowfunctions.h"
+ 
++using std::pow;
++
+ namespace KeyFinder {
+ 
+   double WindowFunction::window(temporal_window_t windowType, int n, int N) const {