$NetBSD$

Use namespaces to link against libcereal >= 1.3.1 from:
https://github.com/prusa3d/PrusaSlicer/commit/0ffcfd8393457fd035576436752267c9a1e6bbcc

--- src/libslic3r/CMakeLists.txt.orig	2022-04-22 11:01:19.000000000 +0000
+++ src/libslic3r/CMakeLists.txt
@@ -337,7 +337,7 @@ target_include_directories(libslic3r PUB
 target_link_libraries(libslic3r
     libnest2d
     admesh
-    cereal
+    cereal::cereal
     libigl
     miniz
     boost_libs
