Revert "patches: add temporary mp3 decoding fix"

This reverts commit acef484c.

This wasn't ever needed since the new gas-pp version was taken
in use at the end of May. The decoding issues in the latest release
must have come from either using an older version of gas-pp by accident
or from not updating the contribs used by the rest of the build system
properly.

patches/0014-contrib-disable-some-ARM-ASM-in-libav-until.patch

-From 21f48a547078381a52f9254985441f10a69e957d Mon Sep 17 00:00:00 2001
-From: Gleb Pinigin <gpinigin@gmail.com>
-Date: Mon, 13 May 2013 21:09:24 +0700
-Subject: [PATCH 14/14] contrib: disable some ARM ASM in libav until
-
----
- contrib/src/ffmpeg/rules.mak | 6 ++++++
- 1 file changed, 6 insertions(+)
-
-diff --git a/contrib/src/ffmpeg/rules.mak b/contrib/src/ffmpeg/rules.mak
-index 36b491c..2cabd40 100644
---- a/contrib/src/ffmpeg/rules.mak
-+++ b/contrib/src/ffmpeg/rules.mak
-@@ -56,6 +56,12 @@ ifeq ($(ARCH),arm)
- FFMPEGCONF += --arch=arm
- ifdef HAVE_NEON
- FFMPEGCONF += --enable-neon
-+ifdef HAVE_IOS
-+FFMPEGCONF += --disable-armv5te
-+FFMPEGCONF += --disable-armv6
-+FFMPEGCONF += --disable-armv6t2
-+FFMPEGCONF += --extra-cflags='-mfpu=neon -mfloat-abi=softfp -mvectorize-with-neon-quad'
-+endif
- endif
- ifdef HAVE_ARMV7A
- FFMPEGCONF += --cpu=cortex-a8
--- 
-1.7.12.4 (Apple Git-37)
-