Enable xen on armhf and amd64

Based on a patch by Yann Soubeyrand

Closes: #795516

debian/control

@@ -17,7 +17,7 @@ Build-Depends:
  libgnutls28-dev,
  libavahi-client-dev,
  libsasl2-dev,
- libxen-dev (>= 4.3) [i386 amd64],
+ libxen-dev (>= 4.3) [i386 amd64 armhf arm64],
  lvm2 [linux-any],
  open-iscsi [linux-any],
  libparted0-dev (>= 2.2),
@@ -206,7 +206,7 @@ Description: documentation for the libvirt library
 Package: libvirt-dev
 Architecture: any
 Section: libdevel
-Depends: ${misc:Depends}, libvirt0 (= ${binary:Version}), libxen-dev [i386 amd64]
+Depends: ${misc:Depends}, libvirt0 (= ${binary:Version}), libxen-dev [i386 amd64 armhf arm64]
 Replaces: libvirt-bin (<< 1.2.0~)
 Recommends: pkg-config
 Description: development files for the libvirt library

debian/rules

@@ -7,15 +7,18 @@ DEB_BUILDUSER=${USER}
 
 ifneq (,$(findstring $(DEB_HOST_ARCH_OS), linux))
   ifneq (,$(findstring $(DEB_HOST_ARCH), i386 amd64))
-    WITH_XEN = --with-xen
-    WITH_LIBXL = --with-libxl
     WITH_VBOX = --with-vbox
     MAKE_CHECK = 1
+  else
+    WITH_VBOX           = --without-vbox
+  endif
+  ifneq (,$(findstring $(DEB_HOST_ARCH), i386 amd64 armhf arm64))
+    WITH_XEN = --with-xen
+    WITH_LIBXL = --with-libxl
     XEN_ENABLED = 1
   else
     WITH_XEN            = --without-xen
     WITH_LIBXL          = --without-libxl
-    WITH_VBOX           = --without-vbox
   endif
   WITH_STORAGE_LVM    = --with-storage-lvm
   WITH_STORAGE_ISCSI  = --with-storage-iscsi