Canonicalize hostarch name ppc64le to ppc64

See bnc#894956

Index: libvirt-4.10.0/src/util/virarch.c
===================================================================
--- libvirt-4.10.0.orig/src/util/virarch.c
+++ libvirt-4.10.0/src/util/virarch.c
@@ -172,6 +172,8 @@ virArch virArchFromHost(void)
         arch = VIR_ARCH_I686;
     } else if (STREQ(ut.machine, "amd64")) {
         arch = VIR_ARCH_X86_64;
+    } else if (STREQ(ut.machine, "ppc64le")) {
+        arch = VIR_ARCH_PPC64;
     } else {
         /* Otherwise assume the canonical name */
         if ((arch = virArchFromString(ut.machine)) == VIR_ARCH_NONE) {