gdb: Fix ia64 defining TRAP_HWBKPT before including gdb_wait.h

On ia64, gdb_wait.h eventually includes siginfo-consts-arch.h, which
contains an enum with TRAP_HWBKPT, along with a #define. Thus we cannot
define TRAP_HWBKPT to 4 beforehand, and so gdb_wait.h must be included
earlier; include it from linux-ptrace.h so it can never come afterwards.

gdb/ChangeLog:

	* nat/linux-ptrace.c: Remove unnecessary reinclusion of
	gdb_ptrace.h, and move including gdb_wait.h ...
	* nat/linux-ptrace.h: ... to here.

gdb/ChangeLog

@@ -1,3 +1,9 @@
+2018-01-19  James Clarke  <jrtc27@jrtc27.com>
+
+	* nat/linux-ptrace.c: Remove unnecessary reinclusion of
+	gdb_ptrace.h, and move including gdb_wait.h ...
+	* nat/linux-ptrace.h: ... to here.
+
 2018-01-19  Simon Marchi  <simon.marchi@ericsson.com>
 
 	* inf-ptrace.c (inf_ptrace_detach): Adjust call to

gdb/nat/linux-ptrace.c

@@ -21,8 +21,6 @@
 #include "linux-procfs.h"
 #include "linux-waitpid.h"
 #include "buffer.h"
-#include "gdb_wait.h"
-#include "gdb_ptrace.h"
 #ifdef HAVE_SYS_PROCFS_H
 #include <sys/procfs.h>
 #endif

gdb/nat/linux-ptrace.h

@@ -21,6 +21,7 @@
 struct buffer;
 
 #include "nat/gdb_ptrace.h"
+#include "gdb_wait.h"
 
 #ifdef __UCLIBC__
 #if !(defined(__UCLIBC_HAS_MMU__) || defined(__ARCH_HAS_MMU__))