Auto merge of #3352 - cd-work:timens_constant, r=JohnTitor

Add time namespace constant

This constant is a possible bitflag argument for `unshare`: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/include/uapi/linux/sched.h?h=v6.6-rc1#n44

I am unsure about its support in Fuchsia, which is why I have not added the constant there.

Author: bors

libc-test/semver/linux.txt

@@ -292,6 +292,7 @@ CLONE_THREAD
 CLONE_UNTRACED
 CLONE_VFORK
 CLONE_VM
+CLONE_NEWTIME
 CLOSE_RANGE_CLOEXEC
 CLOSE_RANGE_UNSHARE
 CMSG_DATA

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

@@ -944,6 +944,9 @@ pub const NT_PRFPXREG: ::c_int = 20;
 
 pub const ELFOSABI_ARM_AEABI: u8 = 64;
 
+// linux/sched.h
+pub const CLONE_NEWTIME: ::c_int = 0x80;
+
 // linux/keyctl.h
 pub const KEYCTL_DH_COMPUTE: u32 = 23;
 pub const KEYCTL_PKEY_QUERY: u32 = 24;