contrib: update mpg123 to 1.28.0

Quoting mpg123.de website:

"Fix misguided handling of part2_3_length checks in
III_get_scale_factors_1() and III_get_scale_factors_2() which
invalidated decoding of a mono source encoded as ms+i-stereo.
This was a regression introduced with version 1.25.7."

Fixes #25798

contrib/src/mpg123/SHA512SUMS

@@ -1 +1 @@
-aa63fcb08b243a1e09f7701b3d84a19d7412a87253d54d49f014fdb9e75bbc81d152a41ed750fccde901453929b2a001585a7645351b41845ad205c17a73dcc9  mpg123-1.26.2.tar.bz2
+4e333ee4f3bbebcfff280cf286265e969a8da93b9043d03c0189e22cd40918b07bf12181bd06141d4479c78bc0d0ed472e0d3bb61b2fdb96fe9f7cd48f9a6b77  mpg123-1.28.0.tar.bz2

contrib/src/mpg123/fix-arm_fpu.patch

@@ -0,0 +1,23 @@
+From e9f8967461ac2498f8af9e3127188c0095f9306c Mon Sep 17 00:00:00 2001
+From: thor <thor@35dc7657-300d-0410-a2e5-dc2837fedb53>
+Date: Mon, 7 Jun 2021 19:21:27 +0000
+Subject: [PATCH] build: fix arm_fpu setup again
+
+git-svn-id: svn://scm.orgis.org/mpg123/trunk@4945 35dc7657-300d-0410-a2e5-dc2837fedb53
+---
+ configure.ac | 2 +-
+ 1 files changed, 1 insertions(+), 1 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index de90297f..9753588e 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -1436,7 +1436,7 @@ case $cpu_type in
+   ;;
+   arm_fpu)
+     ADD_CPPFLAGS="$ADD_CPPFLAGS -DOPT_MULTI -DOPT_GENERIC -DOPT_GENERIC_DITHER -DOPT_NEON -DREAL_IS_FLOAT"
+-    more_sources="$s_neon$s_dither $s_arm_multi"
++    more_sources="$s_neon $s_dither $s_arm_multi"
+   ;;
+   neon64)
+     ADD_CPPFLAGS="$ADD_CPPFLAGS -DOPT_NEON64 -DREAL_IS_FLOAT"

contrib/src/mpg123/rules.mak

@@ -1,5 +1,5 @@
 # mpg123
-MPG123_VERSION := 1.26.2
+MPG123_VERSION := 1.28.0
 MPG123_URL := $(SF)/mpg123/mpg123/$(MPG123_VERSION)/mpg123-$(MPG123_VERSION).tar.bz2
 
 PKGS += mpg123
@@ -41,9 +41,8 @@ $(TARBALLS)/mpg123-$(MPG123_VERSION).tar.bz2:
 
 mpg123: mpg123-$(MPG123_VERSION).tar.bz2 .sum-mpg123
 	$(UNPACK)
-	# remove generated file from the source package
-	cd $(UNPACK_DIR) && rm -rf src/libsyn123/syn123.h
 	$(APPLY) $(SRC)/mpg123/no-programs.patch
+	$(APPLY) $(SRC)/mpg123/fix-arm_fpu.patch
 	$(call pkg_static,"libmpg123.pc.in")
 	$(MOVE)