ffmpeg: use memalign and posix_memalign

Otherwise we get misaligned allocations.
This gets ffplay working on Haiku, so we have at least one simple media
player to cover basic needs.

media-video/ffmpeg/ffmpeg-3.4.1.recipe

@@ -7,7 +7,7 @@ COPYRIGHT="2000-2003 Fabrice Bellard
 	2003-2017 the FFmpeg developers"
 LICENSE="GNU LGPL v2.1
 	GNU GPL v2"
-REVISION="3"
+REVISION="4"
 SOURCE_URI="https://ffmpeg.org/releases/ffmpeg-$portVersion.tar.xz"
 CHECKSUM_SHA256="5a77278a63741efa74e26bf197b9bb09ac6381b9757391b922407210f0f991c0"
 PATCHES="ffmpeg-$portVersion.patchset"

media-video/ffmpeg/patches/ffmpeg-3.4.1.patchset

@@ -1,14 +1,14 @@
-From a3a73c183d740c6b9e3f52dc26e401ca2a0ad11b Mon Sep 17 00:00:00 2001
+From 6ed8a346799f20ba114b314d1054a30add1c4044 Mon Sep 17 00:00:00 2001
 From: Jerome Duval <jerome.duval@gmail.com>
 Date: Mon, 16 Oct 2017 18:31:07 +0200
 Subject: disable ebx on x86.
 
 
 diff --git a/configure b/configure
-index 18d80ee..1547cf8 100755
+index 1797c5d..63ea916 100755
 --- a/configure
 +++ b/configure
-@@ -6594,6 +6594,7 @@ enabled threads && ! enabled pthreads && ! enabled atomics_native && die "non pt
+@@ -6595,6 +6595,7 @@ enabled threads && ! enabled pthreads && ! enabled atomics_native && die "non pt
  if test $target_os = "haiku"; then
      disable memalign
      disable posix_memalign
@@ -17,10 +17,10 @@ index 18d80ee..1547cf8 100755
  
  # add_dep lib dep
 -- 
-2.14.2
+2.15.1
 
 
-From 54d69f3a0979721f61b46c3beb13c50b8836ae62 Mon Sep 17 00:00:00 2001
+From 3780da8297339a332322d7c38e16f7dd42337bd9 Mon Sep 17 00:00:00 2001
 From: Nicolas George <george@nsup.org>
 Date: Fri, 27 Oct 2017 20:46:28 +0200
 Subject: lavf/avio: temporarily accept 0 as EOF.
@@ -119,5 +119,33 @@ index 878917d..ba400e1 100644
  
  #ifndef FF_API_R_FRAME_RATE
 -- 
-2.14.2
+2.15.1
+
+
+From f449ce0153359ef24e5afbf49144c539be92f789 Mon Sep 17 00:00:00 2001
+From: Adrien Destugues <pulkomandy@pulkomandy.tk>
+Date: Fri, 2 Feb 2018 11:39:47 +0100
+Subject: Re-enable memalign for Haiku
+
+This had been disabled in 2011:
+https://lists.ffmpeg.org/pipermail/ffmpeg-cvslog/2011-June/038362.html
+
+If there are still problems with it we should rather fix them on Haiku
+side.
+
+diff --git a/configure b/configure
+index 63ea916..e8f55bf 100755
+--- a/configure
++++ b/configure
+@@ -6593,8 +6593,6 @@ enabled threads && ! enabled pthreads && ! enabled atomics_native && die "non pt
+ 
+ 
+ if test $target_os = "haiku"; then
+-    disable memalign
+-    disable posix_memalign
+     enabled x86_32 && enabled shared && disable ebx_available
+ fi
+ 
+-- 
+2.15.1