Add NT_ARM_PAC_ENABLED_KEYS to elf.h

[Joseph Myers]

This patch adds the new NT_ARM_PAC_ENABLED_KEYS constant from Linux
5.13 to glibc's elf.h.

Tested for x86_64.

diff --git a/elf/elf.h b/elf/elf.h
index 2a62b98d4a..4738dfa28f 100644
--- a/elf/elf.h
+++ b/elf/elf.h
@@ -816,6 +816,8 @@ typedef struct
 					   generic key.  */
 #define NT_ARM_TAGGED_ADDR_CTRL	0x409	/* AArch64 tagged address
 					   control.  */
+#define NT_ARM_PAC_ENABLED_KEYS	0x40a	/* AArch64 pointer authentication
+					   enabled keys.  */
 #define NT_VMCOREDD	0x700		/* Vmcore Device Dump Note.  */
 #define NT_MIPS_DSP	0x800		/* MIPS DSP ASE registers.  */
 #define NT_MIPS_FP_MODE	0x801		/* MIPS floating-point mode.  */

-- 
Joseph S. Myers
joseph@codesourcery.com