Remove redundant `unsafe` from a couple classes

src/BizHawk.Bizware.Audio/SDL2WavStream.cs

@@ -135,7 +135,7 @@ namespace BizHawk.Bizware.Audio
 		public override void Write(byte[] buffer, int offset, int count)
 			=> throw new NotSupportedException();
 
-		private unsafe class SDLRwOpsStreamWrapper : IDisposable
+		private sealed class SDLRwOpsStreamWrapper : IDisposable
 		{
 			public IntPtr Rw { get; private set; }
 			private readonly Stream _s;
@@ -146,7 +146,7 @@ namespace BizHawk.Bizware.Audio
 			private readonly SDLRWopsWriteCallback _writeCallback;
 			private readonly SDLRWopsCloseCallback _closeCallback;
 
-			public SDLRwOpsStreamWrapper(Stream s)
+			public unsafe SDLRwOpsStreamWrapper(Stream s)
 			{
 				Rw = SDL_AllocRW();
 				if (Rw == IntPtr.Zero)

src/BizHawk.Common/Serializer.cs

@@ -9,7 +9,7 @@ using BizHawk.Common.BufferExtensions;
 
 namespace BizHawk.Common
 {
-	public unsafe class Serializer
+	public class Serializer
 	{
 		public Serializer() { }
 
@@ -821,6 +821,7 @@ namespace BizHawk.Common
 			return _currSection.Items.ContainsKey(key);
 		}
 
+#if false
 		private void SyncBuffer(string name, int elemsize, int len, void* ptr)
 		{
 			if (IsReader)
@@ -838,6 +839,7 @@ namespace BizHawk.Common
 				Sync(name, ref temp, false);
 			}
 		}
+#endif
 
 		private void SyncText(string name, ref byte val)
 		{