cstr_core has a default alloc feature that requires a global allocator

Cargo.toml

@@ -12,7 +12,7 @@ readme = "README.md"
 
 [dependencies]
 cty = "0.2.1"
-cstr_core = "0.2.2"
+cstr_core = { version = "0.2.2", default-features = false }
 bitflags = "1.2.1"
 itertools = { version = "0.9.0", default-features = false }