attract: add patch for ffmpeg-4.0.1.

srcpkgs/attract/patches/ffmpeg4.patch

@@ -0,0 +1,26 @@
+--- src/media.cpp      2017-11-19 00:08:04.000000000 +0100
++++ src/media.cpp   2018-05-08 22:32:36.387186528 +0200
+@@ -970,11 +970,11 @@
+
+        size_t avio_ctx_buffer_size = 4096;
+        uint8_t *avio_ctx_buffer = (uint8_t *)av_malloc( avio_ctx_buffer_size
+-                       + FF_INPUT_BUFFER_PADDING_SIZE );
++                       + AV_INPUT_BUFFER_PADDING_SIZE );
+
+        memset( avio_ctx_buffer + avio_ctx_buffer_size,
+                0,
+-               FF_INPUT_BUFFER_PADDING_SIZE );
++               AV_INPUT_BUFFER_PADDING_SIZE );
+
+        m_imp->m_io_ctx = avio_alloc_context( avio_ctx_buffer,
+                avio_ctx_buffer_size, 0, z, &fe_zip_read,
+@@ -1030,7 +1030,7 @@
+                                //
+                                m_audio->buffer = (sf::Int16 *)av_malloc(
+                                        MAX_AUDIO_FRAME_SIZE
+-                                       + FF_INPUT_BUFFER_PADDING_SIZE
++                                       + AV_INPUT_BUFFER_PADDING_SIZE
+                                        + codec_ctx->sample_rate );
+
+                                sf::SoundStream::initialize(
+

srcpkgs/attract/template

@@ -1,7 +1,7 @@
 # Template file for 'attract'
 pkgname=attract
 version=2.3.0
-revision=2
+revision=3
 build_style=gnu-makefile
 hostmakedepends="pkg-config"
 make_build_args="VERBOSE=1"