gdb: xtensa: fix linux ptrace includes

Currently, xtensa code using the Linux ptrace interface only include
sys/ptrace.h.  This file comes from the C library (glibc and uClibc,
at least), and includes a declaration of the ptrace() functions, along
with some cross architecture constants that are mostly copied from the
file located at include/uapi/linux/ptrace.h in recent Linux kernels.

For xtensa specific constants like PTRACE_GETXTREGS and
PTRACE_SETXTREGS the asm/ptrace.h include from the Linux kernel UAPI
is needed.  The code in gdbserver xtensa specific part doesn't call
ptrace() directly, so we can remove the unneeded sys/ptrace.h include.
The gdb xtensa specific code needs both headers, since it calls
ptrace().

gdb/
	* xtensa-linux-nat.c: Include asm/ptrace.h.

gdb/gdbserver/
	* linux-xtensa-low.c: Include asm/ptrace.h instead of
	sys/ptrace.h.

gdb/ChangeLog

@@ -1,3 +1,7 @@
+2014-01-20  Baruch Siach  <baruch@tkos.co.il>
+
+	* xtensa-linux-nat.c: Include asm/ptrace.h.
+
 2014-01-17  Iain Buclaw  <ibuclaw@gdcproject.org>
 
 	* Makefile.in (SFILES): Add d-support.c.

gdb/gdbserver/ChangeLog

@@ -1,3 +1,8 @@
+2014-01-20  Baruch Siach  <baruch@tkos.co.il>
+
+	* linux-xtensa-low.c: Include asm/ptrace.h instead of
+	sys/ptrace.h.
+
 2014-01-17  Pedro Alves  <palves@redhat.com>
 
 	PR build/16445

gdb/gdbserver/linux-xtensa-low.c

@@ -24,7 +24,7 @@
 void init_registers_xtensa (void);
 extern const struct target_desc *tdesc_xtensa;
 
-#include <sys/ptrace.h>
+#include <asm/ptrace.h>
 #include <xtensa-config.h>
 
 #include "xtensa-xtregs.c"

gdb/xtensa-linux-nat.c

@@ -36,6 +36,7 @@
 #include <fcntl.h>
 #include <sys/procfs.h>
 #include <sys/ptrace.h>
+#include <asm/ptrace.h>
 
 #include "gregset.h"
 #include "xtensa-tdep.h"