audio/opus: fix build on arm

* fix the build on 32-bit arm[1]
* GitHub does not have a release tarball for this release[2]

PR:		277537
Obtained from:	fuz [1]
Reported by:	diizzy [2]

audio/opus/Makefile

@@ -1,8 +1,7 @@
 PORTNAME=	opus
 DISTVERSION=	1.5.1
 CATEGORIES=	audio
-MASTER_SITES=	https://downloads.xiph.org/releases/opus/ \
-		https://github.com/xiph/opus/releases/download/v${DISTVERSION}/
+MASTER_SITES=	https://downloads.xiph.org/releases/opus/
 
 MAINTAINER=	naddy@FreeBSD.org
 COMMENT=	IETF audio codec

audio/opus/files/patch-dnn_vec__neon.h

@@ -0,0 +1,11 @@
+--- dnn/vec_neon.h.orig	2024-03-12 15:41:06 UTC
++++ dnn/vec_neon.h
+@@ -34,7 +34,7 @@
+ #include <arm_neon.h>
+ #include "os_support.h"
+ 
+-#if defined(__arm__) && !defined(__aarch64__)
++#if __ARM_ARCH < 8
+ /* Emulate vcvtnq_s32_f32() for ARMv7 Neon. */
+ static OPUS_INLINE int32x4_t vcvtnq_s32_f32(float32x4_t x) {
+   return vrshrq_n_s32(vcvtq_n_s32_f32(x, 8), 8);