ia64-dis.c: Undefine ABS to avoid clash with glib

Undefine ABS to avoid a clash with the macro that glib.h
helpfully defines for us (and a resulting build failure
on ia64 hosts).

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
diff --git a/ia64-dis.c b/ia64-dis.c
index 2886df3..2a103e6 100644
--- a/ia64-dis.c
+++ b/ia64-dis.c
@@ -781,6 +781,9 @@
   return 0;
 }
 
+/* glib.h defines ABS so we must undefine it to avoid a clash */
+#undef ABS
+
 #define CST	IA64_OPND_CLASS_CST
 #define REG	IA64_OPND_CLASS_REG
 #define IND	IA64_OPND_CLASS_IND