Making libz-ng-sys dependency contingent on having serialization feature enabled

Author: luketpeterson

Cargo.toml

@@ -25,7 +25,7 @@ smallvec = {version = "1.13.2", features = ["union"]}
 arrayvec = "0.7.6"
 num-traits = "0.2"
 tikv-jemallocator = {version = "0.6.0", optional = true}
-libz-ng-sys = {version = "1" } # for any serialzation
+libz-ng-sys = {version = "1", optional = true } # for any serialzation
 rand_distr = { version = "0.5.1", optional = true }
 rand = { version = "0.9.0", optional = true }
 memmap2 = { version="0.9.5", optional = true }
@@ -48,7 +48,7 @@ slim_ptrs = [] # Enables use of a 64-bit inter-node pointer type (TrieNodeODRc)
 slim_dispatch = [] # Experiment. Enables the 64-bit pointers to back the TaggedNodeRef and TaggedNodeRefMut types, WILL BE REMOVED EVENTUALLY
 act_counters = ["arena_compact"] # LP: Question: Why isn't this code enabled by just counters + arena_compact???
 viz = []
-serialization = []
+serialization = ["dep:libz-ng-sys"]
 
 [target.'cfg(not(any(miri,target_arch="riscv64")))'.dependencies]
 gxhash = {version="3.5"} # for dag_serialization, merkleization, and caching catamorphism