Update to bitflags 2

bch_bindgen -> bindgen already requires bitflags 2,
so this can eliminate a duplicate dependency.

Cargo.lock

@@ -95,7 +95,7 @@ dependencies = [
  "anyhow",
  "bindgen",
  "bitfield",
- "bitflags 1.3.2",
+ "bitflags",
  "paste",
  "pkg-config",
  "uuid",
@@ -107,7 +107,7 @@ version = "0.69.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "271383c67ccabffb7381723dea0672a673f292304fcb45c01cc648c7a8d58088"
 dependencies = [
- "bitflags 2.6.0",
+ "bitflags",
  "cexpr",
  "clang-sys",
  "itertools",
@@ -130,12 +130,6 @@ version = "0.14.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2d7e60934ceec538daadb9d8432424ed043a904d8e0243f3c6446bce549a46ac"
 
-[[package]]
-name = "bitflags"
-version = "1.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
-
 [[package]]
 name = "bitflags"
 version = "2.6.0"
@@ -480,7 +474,7 @@ version = "0.38.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8acb788b847c24f28525660c4d7758620a7210875711f79e7f663cc152726811"
 dependencies = [
- "bitflags 2.6.0",
+ "bitflags",
  "errno 0.3.9",
  "libc",
  "linux-raw-sys",

bch_bindgen/Cargo.toml

@@ -13,7 +13,7 @@ crate-type = ["lib"]
 anyhow = "1.0"
 uuid = "1.2.2"
 bitfield = "0.14.0"
-bitflags = "1.3.2"
+bitflags = "2"
 paste = "1.0.11"
 
 [build-dependencies]

bch_bindgen/src/btree.rs

@@ -71,7 +71,7 @@ impl<'t> BtreeIter<'t> {
                 iter.as_mut_ptr(),
                 btree,
                 pos,
-                flags.bits as u32,
+                flags.bits().into(),
             );
 
             BtreeIter {
@@ -156,7 +156,7 @@ impl<'t> BtreeNodeIter<'t> {
                 pos,
                 locks_want,
                 depth,
-                flags.bits as u32,
+                flags.bits().into(),
             );
 
             BtreeNodeIter {