libgo: redefine ia64 struct names around linux/ptrace.h

Avoid https://sourceware.org/bugzilla/show_bug.cgi?id=762.

Patch by Andreas Schwab.

Change-Id: I4b2f0bc3a403020f7d5a230f7defbf8ad380cfb8
Reviewed-on: https://go-review.googlesource.com/46711
Reviewed-by: Ian Lance Taylor <iant@golang.org>

libgo/sysinfo.c

diff --git a/libgo/sysinfo.c b/libgo/sysinfo.c
index a1afc7d..1ba27b1 100644
--- a/libgo/sysinfo.c
+++ b/libgo/sysinfo.c
@@ -103,7 +103,12 @@
 #include <linux/netlink.h>
 #endif
 #if defined(HAVE_LINUX_PTRACE_H)
+/* Avoid https://sourceware.org/bugzilla/show_bug.cgi?id=762 .  */
+#define ia64_fpreg pt_ia64_fpreg
+#define pt_all_user_regs pt_ia64_all_user_regs
 #include <linux/ptrace.h>
+#undef ia64_fpreg
+#undef pt_all_user_regs
 #endif
 #if defined(HAVE_LINUX_RTNETLINK_H)
 #include <linux/rtnetlink.h>