Cleanup.

src/bgfx.cpp

@@ -2227,7 +2227,7 @@ namespace bgfx
 
 					m_exit = true;
 				}
-				// fall through
+				BX_FALLTHROUGH;
 
 			case CommandBuffer::End:
 				end = true;

src/shader_dxbc.cpp

@@ -1767,7 +1767,7 @@ namespace bgfx
 			{
 			case DXBC_CHUNK_SHADER_EX:
 				_dxbc.shader.shex = true;
-				// fallthrough
+				BX_FALLTHROUGH;
 
 			case DXBC_CHUNK_SHADER:
 				size += read(_reader, _dxbc.shader, _err);