Auto merge of #3340 - devnexen:linux_madv_collapse, r=JohnTitor

linux MADV_COLLAPSE addition

Author: bors

libc-test/build.rs

@@ -3805,6 +3805,9 @@ fn test_linux(target: &str) {
             | "MADV_POPULATE_WRITE"
             if musl => true,
 
+            // kernel 6.1 minimum
+            "MADV_COLLAPSE" => true,
+
             // FIXME: Requires more recent kernel headers
             | "IFLA_PARENT_DEV_NAME"     // linux v5.13+
             | "IFLA_PARENT_DEV_BUS_NAME" // linux v5.13+

libc-test/semver/linux-gnu.txt

@@ -118,6 +118,7 @@ LM_ID_BASE
 LM_ID_NEWLM
 LOGIN_PROCESS
 Lmid_t
+MADV_COLLAPSE
 MAXTC
 MAX_LINKS
 MINIX2_SUPER_MAGIC

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

@@ -1093,6 +1093,8 @@ 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;
 
+pub const MADV_COLLAPSE: ::c_int = 25;
+
 cfg_if! {
     if #[cfg(any(
         target_arch = "arm",