control: Drop i386 from Xen arches

Starting with Xen version 4.16, Xen is no longer built on
the i386 architecture in Debian.

Closes: #1006300

debian/control

@@ -44,7 +44,7 @@ Build-Depends:
  libtirpc-dev,
  libudev-dev [linux-any],
  libwireshark-dev,
- libxen-dev [amd64 arm64 armhf i386],
+ libxen-dev [amd64 arm64 armhf],
  libxml2-dev,
  libxml2-utils,
  libyajl-dev,
@@ -220,7 +220,7 @@ Description: Virtualization daemon VirtualBox connection driver
 
 Package: libvirt-daemon-driver-xen
 Section: admin
-Architecture: amd64 arm64 armhf i386
+Architecture: amd64 arm64 armhf
 Multi-Arch: no
 Depends:
  libvirt-daemon (= ${binary:Version}),
@@ -473,7 +473,7 @@ Architecture: any
 Multi-Arch: same
 Depends:
  libvirt0 (= ${binary:Version}),
- libxen-dev [i386 amd64 armhf arm64],
+ libxen-dev [amd64 armhf arm64],
  ${misc:Depends},
 Recommends:
  pkg-config,

debian/rules

@@ -16,7 +16,7 @@ DPKG_EXPORT_BUILDFLAGS = 1
 include /usr/share/dpkg/buildflags.mk
 
 ARCHES_LXC  = alpha amd64 arm64 armel armhf hppa i386 m68k mips64el mipsel powerpc ppc64 ppc64el riscv64 s390x sh4 sparc64 x32
-ARCHES_XEN  = amd64 arm64 armhf i386
+ARCHES_XEN  = amd64 arm64 armhf
 ARCHES_VBOX = amd64 i386
 
 ifneq (,$(findstring $(DEB_HOST_ARCH_OS), linux))