Auto merge of #3505 - GuillaumeGomez:new-consts, r=JohnTitor

Add constants from <include/linux/sched.h>

Needed for `sysinfo` as usual. :)

Constants come from https://github.com/torvalds/linux/blob/master/include/linux/sched.h.

Author: bors

libc-test/build.rs

@@ -4059,6 +4059,33 @@ fn test_linux(target: &str) {
                 true
             }
 
+            // FIXME: seems to not be available all the time (from <include/linux/sched.h>:
+            "PF_VCPU"
+            | "PF_IDLE"
+            | "PF_EXITING"
+            | "PF_POSTCOREDUMP"
+            | "PF_IO_WORKER"
+            | "PF_WQ_WORKER"
+            | "PF_FORKNOEXEC"
+            | "PF_MCE_PROCESS"
+            | "PF_SUPERPRIV"
+            | "PF_DUMPCORE"
+            | "PF_SIGNALED"
+            | "PF_MEMALLOC"
+            | "PF_NPROC_EXCEEDED"
+            | "PF_USED_MATH"
+            | "PF_USER_WORKER"
+            | "PF_NOFREEZE"
+            | "PF_KSWAPD"
+            | "PF_MEMALLOC_NOFS"
+            | "PF_MEMALLOC_NOIO"
+            | "PF_LOCAL_THROTTLE"
+            | "PF_KTHREAD"
+            | "PF_RANDOMIZE"
+            | "PF_NO_SETAFFINITY"
+            | "PF_MCE_EARLY"
+            | "PF_MEMALLOC_PIN" => true,
+
             _ => false,
         }
     });

src/unix/linux_like/linux/mod.rs

@@ -4519,6 +4519,33 @@ pub const NET_NETFILTER: ::c_int = 19;
 pub const NET_DCCP: ::c_int = 20;
 pub const NET_IRDA: ::c_int = 412;
 
+// include/linux/sched.h
+pub const PF_VCPU: ::c_int = 0x00000001;
+pub const PF_IDLE: ::c_int = 0x00000002;
+pub const PF_EXITING: ::c_int = 0x00000004;
+pub const PF_POSTCOREDUMP: ::c_int = 0x00000008;
+pub const PF_IO_WORKER: ::c_int = 0x00000010;
+pub const PF_WQ_WORKER: ::c_int = 0x00000020;
+pub const PF_FORKNOEXEC: ::c_int = 0x00000040;
+pub const PF_MCE_PROCESS: ::c_int = 0x00000080;
+pub const PF_SUPERPRIV: ::c_int = 0x00000100;
+pub const PF_DUMPCORE: ::c_int = 0x00000200;
+pub const PF_SIGNALED: ::c_int = 0x00000400;
+pub const PF_MEMALLOC: ::c_int = 0x00000800;
+pub const PF_NPROC_EXCEEDED: ::c_int = 0x00001000;
+pub const PF_USED_MATH: ::c_int = 0x00002000;
+pub const PF_USER_WORKER: ::c_int = 0x00004000;
+pub const PF_NOFREEZE: ::c_int = 0x00008000;
+pub const PF_KSWAPD: ::c_int = 0x00020000;
+pub const PF_MEMALLOC_NOFS: ::c_int = 0x00040000;
+pub const PF_MEMALLOC_NOIO: ::c_int = 0x00080000;
+pub const PF_LOCAL_THROTTLE: ::c_int = 0x00100000;
+pub const PF_KTHREAD: ::c_int = 0x00200000;
+pub const PF_RANDOMIZE: ::c_int = 0x00400000;
+pub const PF_NO_SETAFFINITY: ::c_int = 0x04000000;
+pub const PF_MCE_EARLY: ::c_int = 0x08000000;
+pub const PF_MEMALLOC_PIN: ::c_int = 0x10000000;
+
 f! {
     pub fn NLA_ALIGN(len: ::c_int) -> ::c_int {
         return ((len) + NLA_ALIGNTO - 1) & !(NLA_ALIGNTO - 1)