Auto merge of #745 - xd009642:master, r=alexcrichton

Updated types of PTRACE requests for musl to be consistent.

For some reason the type of ptrace request constants in musl change for the register based requests. As they are used in the same way and this doesn't mimic musl this has been changed for consistency and ease of use.

First raised in issue #744

src/unix/notbsd/linux/musl/mod.rs

@@ -171,8 +171,14 @@ pub const PTRACE_POKEUSER: ::c_int = 6;
 pub const PTRACE_CONT: ::c_int = 7;
 pub const PTRACE_KILL: ::c_int = 8;
 pub const PTRACE_SINGLESTEP: ::c_int = 9;
+pub const PTRACE_GETREGS: ::c_int = 12;
+pub const PTRACE_SETREGS: ::c_int = 13;
+pub const PTRACE_GETFPREGS: ::c_int = 14;
+pub const PTRACE_SETFPREGS: ::c_int = 15;
 pub const PTRACE_ATTACH: ::c_int = 16;
 pub const PTRACE_DETACH: ::c_int = 17;
+pub const PTRACE_GETFPXREGS: ::c_int = 18;
+pub const PTRACE_SETFPXREGS: ::c_int = 19;
 pub const PTRACE_SYSCALL: ::c_int = 24;
 pub const PTRACE_SETOPTIONS: ::c_int = 0x4200;
 pub const PTRACE_GETEVENTMSG: ::c_int = 0x4201;
@@ -187,13 +193,6 @@ pub const PTRACE_PEEKSIGINFO: ::c_int = 0x4209;
 
 pub const EPOLLWAKEUP: ::c_int = 0x20000000;
 
-pub const PTRACE_GETFPREGS: ::c_uint = 14;
-pub const PTRACE_SETFPREGS: ::c_uint = 15;
-pub const PTRACE_GETFPXREGS: ::c_uint = 18;
-pub const PTRACE_SETFPXREGS: ::c_uint = 19;
-pub const PTRACE_GETREGS: ::c_uint = 12;
-pub const PTRACE_SETREGS: ::c_uint = 13;
-
 pub const EFD_NONBLOCK: ::c_int = ::O_NONBLOCK;
 
 pub const SFD_NONBLOCK: ::c_int = ::O_NONBLOCK;