Revert "sdl2_mixer: deleted unmaintained port"

This reverts commit 2a2b29711f.

sdl2_mixer/.footprint

@@ -0,0 +1,11 @@
+drwxr-xr-x	root/root	usr/
+drwxr-xr-x	root/root	usr/include/
+drwxr-xr-x	root/root	usr/include/SDL2/
+-rw-r--r--	root/root	usr/include/SDL2/SDL_mixer.h
+drwxr-xr-x	root/root	usr/lib/
+lrwxrwxrwx	root/root	usr/lib/libSDL2_mixer-2.0.so.0 -> libSDL2_mixer-2.0.so.0.2.2
+-rwxr-xr-x	root/root	usr/lib/libSDL2_mixer-2.0.so.0.2.2
+-rwxr-xr-x	root/root	usr/lib/libSDL2_mixer.la
+lrwxrwxrwx	root/root	usr/lib/libSDL2_mixer.so -> libSDL2_mixer-2.0.so.0.2.2
+drwxr-xr-x	root/root	usr/lib/pkgconfig/
+-rw-r--r--	root/root	usr/lib/pkgconfig/SDL2_mixer.pc

sdl2_mixer/.signature

@@ -0,0 +1,5 @@
+untrusted comment: verify with /etc/ports/contrib.pub
+RWSagIOpLGJF342yvKtXbLzFTvBua09/rQCW+YnZzDwyuwPsiPSgYa+KXQ2XoTRQ2sxJz2grtf7/RE9i0ntjKWyRuu5XPzsPRgg=
+SHA256 (Pkgfile) = d12ae3309c5136ba0779da8546d91e2bec05e868cca289bfa20cc1076b1f87d8
+SHA256 (.footprint) = 14206fdd386fa67eeddeab43cc417607792eeeb3a9d3b13b5df2819fa3892aed
+SHA256 (SDL2_mixer-2.0.4.tar.gz) = b4cf5a382c061cd75081cf246c2aa2f9df8db04bdda8dcdc6b6cca55bede2419

sdl2_mixer/Pkgfile

@@ -0,0 +1,18 @@
+# Description: A sample multi-channel audio mixer library.
+# URL: http://www.libsdl.org/projects/SDL_mixer/
+# Maintainer: unmaintained
+# Depends on: libvorbis libmodplug flac libsdl2 mpg123
+
+name=sdl2_mixer
+version=2.0.4
+release=2
+source=(http://www.libsdl.org/projects/SDL_mixer/release/SDL2_mixer-$version.tar.gz)
+
+build() {
+    cd SDL2_mixer-$version
+    CONFIG_SHELL=/bin/bash ./configure \
+        --prefix=/usr \
+        --disable-static
+    make
+    make DESTDIR=$PKG install
+}