Fix cmake-based build

Change-Id: I45349cd6530814efa0c466beb0df7d53b4e17948
Reviewed-on: https://swiftshader-review.googlesource.com/c/23008
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Chris Forbes <chrisforbes@google.com>
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f594e9e..d277cd2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1979,6 +1979,8 @@
     ${VULKAN_DIR}/*.hpp
     ${SOURCE_DIR}/System/Memory.cpp
     ${SOURCE_DIR}/System/Memory.hpp
+    ${SOURCE_DIR}/System/Debug.cpp
+    ${SOURCE_DIR}/System/Debug.hpp
     ${CMAKE_CURRENT_SOURCE_DIR}/include/vulkan/*.h}
 )