clang6 fix: audio/caps-plugins

Here's a potential fix for audio/caps-plugins.

http://build-failures.rhaalovely.net/amd64/2018-04-10/audio/caps-plugins.log

I don't understand why this has become invalid with clang6.

Index: Makefile
===================================================================
RCS file: /cvs/ports/audio/caps-plugins/Makefile,v
retrieving revision 1.9
diff -u -p -r1.9 Makefile
--- Makefile 26 Jul 2017 22:45:15 -0000 1.9
+++ Makefile 12 Apr 2018 22:32:58 -0000
@@ -4,7 +4,7 @@ COMMENT = CAPS LADSPA plugins

V = 0.9.24
DISTNAME = caps_${V}
-REVISION = 1
+REVISION = 2
PKGNAME = caps-plugins-${V}
CATEGORIES = audio
EXTRACT_SUFX = .tar.bz2
Index: patches/patch-dsp_v4f_IIR2_h
===================================================================
RCS file: /cvs/ports/audio/caps-plugins/patches/patch-dsp_v4f_IIR2_h,v
retrieving revision 1.1
diff -u -p -r1.1 patch-dsp_v4f_IIR2_h
--- patches/patch-dsp_v4f_IIR2_h 9 May 2015 08:00:55 -0000 1.1
+++ patches/patch-dsp_v4f_IIR2_h 12 Apr 2018 22:32:58 -0000
@@ -1,6 +1,7 @@
$OpenBSD: patch-dsp_v4f_IIR2_h,v 1.1 2015/05/09 08:00:55 robert Exp $
---- dsp/v4f_IIR2.h.orig Tue Apr 28 08:36:38 2015
-+++ dsp/v4f_IIR2.h Tue Apr 28 08:37:03 2015
+Index: dsp/v4f_IIR2.h
+--- dsp/v4f_IIR2.h.orig
++++ dsp/v4f_IIR2.h
@@ -32,7 +32,7 @@

namespace DSP {
@@ -10,3 +11,26 @@ $OpenBSD: patch-dsp_v4f_IIR2_h,v 1.1 201
inline float pow10f(float f) {return pow(10,f);}