Merge branch 'remove-c-ptrace' into 'master'

remove empty C ptrace bits header

See merge request redox-os/relibc!1115

include/bits/sys/ptrace.h

@@ -1,4 +0,0 @@
-#ifndef _BITS_SYS_PTRACE_H
-#define _BITS_SYS_PTRACE_H
-
-#endif

src/header/sys_ptrace/cbindgen.toml

@@ -2,7 +2,6 @@ sys_includes = []
 include_guard = "_SYS_PTRACE_H"
 language = "C"
 style = "Tag"
-trailer = "#include <bits/sys/ptrace.h>"
 
 [enum]
 prefix_with_name = true