xen-tools: fix ASL QEMU code

In order to build with newer IASL compiler found in FreeBSD 12

Approved by:	bapt
Sponsored by:	Citrix Systems R&D
MFH:		2017Q2

sysutils/xen-tools/Makefile

@@ -3,7 +3,7 @@
 PORTNAME=	xen
 PKGNAMESUFFIX=	-tools
 PORTVERSION=	4.7.2
-PORTREVISION=   1
+PORTREVISION=   2
 CATEGORIES=	sysutils emulators
 MASTER_SITES=	http://downloads.xenproject.org/release/xen/${PORTVERSION}/
 

sysutils/xen-tools/files/iasl-qemuu.patch

@@ -0,0 +1,26 @@
+diff --git a/hw/i386/acpi-dsdt.dsl b/hw/i386/acpi-dsdt.dsl
+index a2d84ecf8f..e86d3eb263 100644
+--- a/hw/i386/acpi-dsdt.dsl
++++ b/hw/i386/acpi-dsdt.dsl
+@@ -62,8 +62,6 @@ DefinitionBlock (
+ 
+     Scope(\_SB.PCI0) {
+ 
+-        External(ISA, DeviceObj)
+-
+         Device(ISA) {
+             Name(_ADR, 0x00010000)
+ 
+diff --git a/hw/i386/q35-acpi-dsdt.dsl b/hw/i386/q35-acpi-dsdt.dsl
+index 16eaca3fae..44fa4a9c0c 100644
+--- a/hw/i386/q35-acpi-dsdt.dsl
++++ b/hw/i386/q35-acpi-dsdt.dsl
+@@ -55,8 +55,6 @@ DefinitionBlock (
+             Name(_ADR, 0x00)
+             Name(_UID, 1)
+ 
+-            External(ISA, DeviceObj)
+-
+             // _OSC: based on sample of ACPI3.0b spec
+             Name(SUPP, 0) // PCI _OSC Support Field value
+             Name(CTRL, 0) // PCI _OSC Control Field value