Add some note n_type constants for GNU extension notes.

src/gabi.rs

@@ -961,3 +961,21 @@ pub const ELFCOMPRESS_HIOS: u32 = 0x6fffffff;
 pub const ELFCOMPRESS_LOPROC: u32 = 0x70000000;
 /// Values in [ELFCOMPRESS_LOPROC, ELFCOMPRESS_HIPROC] are reserved for processor-specific semantics.
 pub const ELFCOMPRESS_HIPROC: u32 = 0x7fffffff;
+
+// Note header descriptor types constants (n_type)
+
+/// ABI information
+/// The descriptor consists of words:
+///     word 0: OS descriptor
+///     word 1: major version of the ABI
+///     word 2: minor version of the ABI
+///     word 3: subminor version of the ABI
+pub const NT_GNU_ABI_TAG: u64 = 1;
+/// Synthetic hwcap information
+pub const NT_GNU_HWCAP: u64 = 2;
+/// Build ID bits as generated by ld --build-id.
+pub const NT_GNU_BUILD_ID: u64 = 3;
+/// Version note generated by GNU gold containing a version string
+pub const NT_GNU_GOLD_VERSION: u64 = 4;
+/// Program property note which describes special handling requirements for linker and run-time loader.
+pub const NT_GNU_PROPERTY_TYPE_0: u64 = 5;