media-sound/vorbisgain: fix modern C issue in configure

Closes: https://bugs.gentoo.org/899862
Signed-off-by: Sam James <sam@gentoo.org>

media-sound/vorbisgain/vorbisgain-0.37-r5.ebuild

@@ -1,8 +1,10 @@
-# Copyright 1999-2022 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
 
+inherit autotools
+
 DESCRIPTION="Calculator of perceived sound level for Ogg Vorbis files"
 HOMEPAGE="https://sjeng.org/vorbisgain.html"
 SRC_URI="https://sjeng.org/ftp/vorbis/${P}.tar.gz"
@@ -13,7 +15,8 @@ KEYWORDS="amd64 ppc ppc64 ~riscv sparc x86"
 
 RDEPEND="
 	media-libs/libogg
-	media-libs/libvorbis"
+	media-libs/libvorbis
+"
 DEPEND="${RDEPEND}"
 
 PATCHES=(
@@ -23,6 +26,13 @@ PATCHES=(
 	"${FILESDIR}"/${P}-wformat-security.patch
 )
 
+src_prepare() {
+	default
+
+	# bug #899862
+	eautoreconf
+}
+
 src_configure() {
 	econf --enable-recursive
 }