scummvm: Disable audio by dropping audio streams

recipes/scummvm/01_redox.patch

+diff -rupNw source-original/audio/mixer.cpp source/audio/mixer.cpp
+--- source-original/audio/mixer.cpp	2017-12-08 23:21:10.000000000 +0100
++++ source/audio/mixer.cpp	2018-12-06 02:03:37.151198853 +0100
+@@ -237,7 +237,9 @@ void MixerImpl::playStream(
+ 	}
+ 
+ 
+-	assert(_mixerReady);
++	if (autofreeStream == DisposeAfterUse::YES)
++		delete stream;
++	return;
+ 
+ 	// Prevent duplicate sounds
+ 	if (id != -1) {
 diff -rupNw source-original/common/stream.cpp source/common/stream.cpp
 --- source-original/common/stream.cpp	2017-12-08 23:21:10.000000000 +0100
-+++ source/common/stream.cpp	2018-11-28 00:36:53.474637267 +0100
++++ source/common/stream.cpp	2018-12-06 02:01:50.454108198 +0100
 @@ -95,7 +95,7 @@ bool MemoryReadStream::seek(int32 offs,
  		break;
  	}
@@ -12,7 +26,7 @@ diff -rupNw source-original/common/stream.cpp source/common/stream.cpp
  	_eos = false;
 diff -rupNw source-original/configure source/configure
 --- source-original/configure	2017-12-08 23:21:13.000000000 +0100
-+++ source/configure	2018-11-28 00:35:33.000000000 +0100
++++ source/configure	2018-12-06 02:01:50.458108239 +0100
 @@ -3610,7 +3610,7 @@ case $_host_os in
  	amigaos* | cygwin* | dreamcast | ds | gamecube | mingw* | n64 | ps2 | ps3 | psp2 | psp | wii | wince)
  		_posix=no