wiggle: depend on bitflags, and re-export it.

Cargo.lock

@@ -2815,6 +2815,7 @@ dependencies = [
 name = "wiggle"
 version = "0.22.0"
 dependencies = [
+ "bitflags",
  "proptest",
  "thiserror",
  "tracing",

crates/wiggle/Cargo.toml

@@ -15,6 +15,7 @@ thiserror = "1"
 witx = { path = "../wasi-common/WASI/tools/witx", version = "0.8.7", optional = true }
 wiggle-macro = { path = "macro", version = "0.22.0" }
 tracing = "0.1.15"
+bitflags = "1.2"
 
 [badges]
 maintenance = { status = "actively-developed" }

crates/wiggle/src/lib.rs

@@ -6,6 +6,7 @@ use std::slice;
 use std::str;
 use std::sync::Arc;
 
+pub use bitflags;
 pub use wiggle_macro::from_witx;
 
 #[cfg(feature = "wiggle_metadata")]