media-libs/sdl-mixer: drop superfluous autoreconf

Upstream commit configure etc to git, so even though they don't make releases, we
don't need autoreconf \o/

Signed-off-by: Sam James <sam@gentoo.org>

media-libs/sdl-mixer/sdl-mixer-1.2.12_p20221010.ebuild

@@ -5,7 +5,7 @@ EAPI=8
 
 # Check SDL-1.2 branch for possible backports/new snapshots
 
-inherit autotools multilib-minimal
+inherit multilib-minimal
 
 SDL_MIXER_COMMIT="7804621c533dddfe970e97c94c4ea72d48ed7f48"
 
@@ -54,12 +54,6 @@ RDEPEND="
 "
 DEPEND="${RDEPEND}"
 
-src_prepare() {
-	default
-
-	eautoreconf
-}
-
 multilib_src_configure() {
 	local myeconfargs=(
 		--disable-music-flac-shared