Comment out PTRACE_EVENT_STOP.

It has been added to glibc in version 2.26.

Author: marmistrz

src/unix/notbsd/mod.rs

@@ -740,7 +740,8 @@ pub const PTRACE_EVENT_EXEC: ::c_int = 4;
 pub const PTRACE_EVENT_VFORK_DONE: ::c_int = 5;
 pub const PTRACE_EVENT_EXIT: ::c_int = 6;
 pub const PTRACE_EVENT_SECCOMP: ::c_int = 7;
-pub const PTRACE_EVENT_STOP: ::c_int = 128;
+// PTRACE_EVENT_STOP was added to glibc in 2.26
+// pub const PTRACE_EVENT_STOP: ::c_int = 128;
 
 pub const __WNOTHREAD: ::c_int = 0x20000000;
 pub const __WALL: ::c_int = 0x40000000;