multimedia/phonon: Switch to upstream's fix for clang 16 build issues

Instead of passing a compiler flag to work around a clang 16 build
issue, adopt the fix that dim@ landed upstream that fixes the code in
question.

PR:			272029
Approved by:		kde (arrowd)
Differential Revision:	https://reviews.freebsd.org/D41307

multimedia/phonon/Makefile

@@ -1,5 +1,6 @@
 PORTNAME=	phonon
 DISTVERSION=	4.11.1
+PORTREVISION=	1
 CATEGORIES=	multimedia kde
 MASTER_SITES=	KDE/stable/${PORTNAME}/${DISTVERSION}
 DIST_SUBDIR=	KDE/phonon
@@ -32,10 +33,4 @@ PULSEAUDIO_USES=	gnome
 PULSEAUDIO_USE=		GNOME=glib20
 PULSEAUDIO_CMAKE_BOOL=	WITH_PulseAudio
 
-.include <bsd.port.pre.mk>
-
-.if ${COMPILER_TYPE} == clang && ${COMPILER_VERSION} >= 160
-CXXFLAGS+=	-Wno-error=enum-constexpr-conversion
-.endif
-
-.include <bsd.port.post.mk>
+.include <bsd.port.mk>

multimedia/phonon/files/patch-069d5a3eb81bcbc730e44c27a0d060a85cf9213d.patch

@@ -0,0 +1,36 @@
+From 069d5a3eb81bcbc730e44c27a0d060a85cf9213d Mon Sep 17 00:00:00 2001
+From: Dimitry Andric <dimitry@andric.com>
+Date: Sun, 16 Jul 2023 15:17:39 +0200
+Subject: [PATCH] Future-proof build fix for clang > 16
+
+Clang is intending to remove the `-Wno-enum-constexpr-conversion` flag
+in the future, because it can invoke undefined behavior.
+
+To avoid the "integer value NNNN is outside the valid range of values
+[0, 7] for the enumeration type 'ObjectDescriptionType'" warnings,
+explicitly specify that the `ObjectDescriptionType` enum uses `unsigned`
+as the underlying type.
+
+This also allows to remove the CMake patch that added the
+`-Wno-enum-constexpr-conversion` flag.
+---
+ phonon/experimental/CMakeLists.txt | 4 ----
+ phonon/objectdescription.h         | 2 +-
+ 2 files changed, 1 insertion(+), 5 deletions(-)
+
+diff --git a/phonon/objectdescription.h b/phonon/objectdescription.h
+index 97fec2e79..6ce92de54 100644
+--- phonon/objectdescription.h
++++ phonon/objectdescription.h
+@@ -43,7 +43,7 @@ namespace Phonon
+      *
+      * \ingroup Backend
+      */
+-    enum ObjectDescriptionType
++    enum ObjectDescriptionType : unsigned
+     {
+         /**
+          * Audio output devices. This can be soundcards (with different drivers), soundservers or
+-- 
+GitLab
+