configure: CONFIG_QEMU_INTERP_PREFIX only for user mode

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

configure

@@ -3395,7 +3395,6 @@ echo "# Automatically generated by configure - do not modify" > $config_target_m
 bflt="no"
 target_nptl="no"
 interp_prefix1=`echo "$interp_prefix" | sed "s/%M/$target_arch2/g"`
-echo "CONFIG_QEMU_INTERP_PREFIX=\"$interp_prefix1\"" >> $config_target_mak
 gdb_xml_files=""
 target_short_alignment=2
 target_int_alignment=4
@@ -3601,6 +3600,7 @@ if test "$target_softmmu" = "yes" ; then
 fi
 if test "$target_user_only" = "yes" ; then
   echo "CONFIG_USER_ONLY=y" >> $config_target_mak
+  echo "CONFIG_QEMU_INTERP_PREFIX=\"$interp_prefix1\"" >> $config_target_mak
 fi
 if test "$target_linux_user" = "yes" ; then
   echo "CONFIG_LINUX_USER=y" >> $config_target_mak