Auto merge of #3303 - Mek101:main, r=JohnTitor

linux/gnu: add glob extension constants

As per title, added
```
GLOB_PERIOD
GLOB_ALTDIRFUNC
GLOB_BRACE
GLOB_NOMAGIC
GLOB_TILDE
GLOB_ONLYDIR
GLOB_TILDE_CHECK
```

Author: bors

libc-test/semver/linux-gnu.txt

@@ -51,6 +51,13 @@ FUTEXFS_SUPER_MAGIC
 GENL_ID_PMCRAID
 GENL_ID_VFS_DQUOT
 GENL_UNS_ADMIN_PERM
+GLOB_ALTDIRFUNC
+GLOB_BRACE
+GLOB_NOMAGIC
+GLOB_ONLYDIR
+GLOB_PERIOD
+GLOB_TILDE
+GLOB_TILDE_CHECK
 HOSTFS_SUPER_MAGIC
 HPFS_SUPER_MAGIC
 HUGETLBFS_MAGIC

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

@@ -1083,6 +1083,16 @@ pub const TIME_ERROR: ::c_int = 5;
 pub const TIME_BAD: ::c_int = TIME_ERROR;
 pub const MAXTC: ::c_long = 6;
 
+// Portable GLOB_* flags are defined at the `linux_like` level.
+// The following are GNU extensions.
+pub const GLOB_PERIOD: ::c_int = 1 << 7;
+pub const GLOB_ALTDIRFUNC: ::c_int = 1 << 9;
+pub const GLOB_BRACE: ::c_int = 1 << 10;
+pub const GLOB_NOMAGIC: ::c_int = 1 << 11;
+pub const GLOB_TILDE: ::c_int = 1 << 12;
+pub const GLOB_ONLYDIR: ::c_int = 1 << 13;
+pub const GLOB_TILDE_CHECK: ::c_int = 1 << 14;
+
 cfg_if! {
     if #[cfg(any(
         target_arch = "arm",