Add special cases for bit packed structs

This commit adds special cases for AccelerationStructureInstanceKHR and
VkAccelerationStructureSRTMotionInstanceNV. These types use bit-packed
fields which are not representable in the current version of the zig
stage 2 compiler. This might change when
https://github.com/ziglang/zig/issues/13009 is resolved.

Fixes #56

generator/build_integration.zig

@@ -104,7 +104,7 @@ pub const ShaderCompileStep = struct {
             const dir = path.dirname(shader.full_out_path).?;
             try cwd.makePath(dir);
 
-            try cmd.appendSlice(&.{shader.source_path, "-o", shader.full_out_path});
+            try cmd.appendSlice(&.{ shader.source_path, "-o", shader.full_out_path });
             try self.builder.spawnChild(cmd.items);
         }
     }