Add missing musl utmpx.h constants

(backport <#3908>)
(cherry picked from commit 6cd88a4)

Author: andrewliebenow

libc-test/semver/linux-musl.txt

@@ -10,25 +10,34 @@ MPOL_DEFAULT
 MPOL_INTERLEAVE
 MPOL_LOCAL
 MPOL_PREFERRED
+BOOT_TIME
+DEAD_PROCESS
 Elf32_Chdr
 Elf64_Chdr
+EMPTY
+INIT_PROCESS
 LIO_NOP
 LIO_NOWAIT
 LIO_READ
 LIO_WAIT
 LIO_WRITE
+LOGIN_PROCESS
+NEW_TIME
+OLD_TIME
 PF_IB
 PF_MPLS
 PF_XDP
 PIDFD_NONBLOCK
 PR_SET_VMA
 PR_SET_VMA_ANON_NAME
+RUN_LVL
 RWF_APPEND
 RWF_DSYNC
 RWF_HIPRI
 RWF_NOWAIT
 RWF_SYNC
 SOL_XDP
+USER_PROCESS
 XDP_SHARED_UMEM
 XDP_COPY
 XDP_ZEROCOPY

src/unix/linux_like/linux/musl/mod.rs

@@ -632,6 +632,18 @@ pub const MAP_HUGE_16GB: ::c_int = 34 << MAP_HUGE_SHIFT;
 
 pub const MS_RMT_MASK: ::c_ulong = 0x02800051;
 
+// include/utmpx.h
+pub const EMPTY: ::c_short = 0;
+pub const RUN_LVL: ::c_short = 1;
+pub const BOOT_TIME: ::c_short = 2;
+pub const NEW_TIME: ::c_short = 3;
+pub const OLD_TIME: ::c_short = 4;
+pub const INIT_PROCESS: ::c_short = 5;
+pub const LOGIN_PROCESS: ::c_short = 6;
+pub const USER_PROCESS: ::c_short = 7;
+pub const DEAD_PROCESS: ::c_short = 8;
+// musl does not define ACCOUNTING
+
 pub const SFD_CLOEXEC: ::c_int = 0x080000;
 
 pub const NCCS: usize = 32;