linux, android: Add CLONE_PIDFD flag

Author: neocturne

libc-test/semver/android.txt

@@ -212,6 +212,7 @@ CLONE_NEWUSER
 CLONE_NEWUTS
 CLONE_PARENT
 CLONE_PARENT_SETTID
+CLONE_PIDFD
 CLONE_PTRACE
 CLONE_SETTLS
 CLONE_SIGHAND

libc-test/semver/linux.txt

@@ -257,6 +257,7 @@ CLONE_NEWUSER
 CLONE_NEWUTS
 CLONE_PARENT
 CLONE_PARENT_SETTID
+CLONE_PIDFD
 CLONE_PTRACE
 CLONE_SETTLS
 CLONE_SIGHAND

src/unix/linux_like/android/mod.rs

@@ -2447,6 +2447,8 @@ pub const SCHED_DEADLINE: ::c_int = 6;
 
 pub const SCHED_RESET_ON_FORK: ::c_int = 0x40000000;
 
+pub const CLONE_PIDFD: ::c_int = 0x1000;
+
 // bits/seek_constants.h
 pub const SEEK_DATA: ::c_int = 3;
 pub const SEEK_HOLE: ::c_int = 4;

src/unix/linux_like/linux/mod.rs

@@ -1509,6 +1509,8 @@ pub const SCHED_IDLE: ::c_int = 5;
 
 pub const SCHED_RESET_ON_FORK: ::c_int = 0x40000000;
 
+pub const CLONE_PIDFD: ::c_int = 0x1000;
+
 // netinet/in.h
 // NOTE: These are in addition to the constants defined in src/unix/mod.rs