References: bsc#1216986 - libguestfs: embeds /etc/hosts (also bsc#1237212)
Removes etc/hosts from base.tar.gz which will be different for each
build environment.

Index: libguestfs-1.56.0/appliance/Makefile.am
===================================================================
--- libguestfs-1.56.0.orig/appliance/Makefile.am
+++ libguestfs-1.56.0/appliance/Makefile.am
@@ -62,6 +62,7 @@ stamp-supermin: make.sh packagelist supe
 	  supermin.d/hostfiles \
 	  supermin.d/init.tar.gz \
 	  supermin.d/udev-rules.tar.gz
+	gunzip supermin.d/base.tar.gz; tar --delete ./etc/hosts -f supermin.d/base.tar 2>/dev/null; gzip -n9 supermin.d/base.tar
 	touch $@
 
 clean-supermin-appliance: