rename CONFIG_QEMU_PREFIX

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
diff --git a/configure b/configure
index f7b0a6d..6f282a3 100755
--- a/configure
+++ b/configure
@@ -2430,7 +2430,7 @@
 bflt="no"
 target_nptl="no"
 interp_prefix1=`echo "$interp_prefix" | sed "s/%M/$target_arch2/g"`
-echo "CONFIG_QEMU_PREFIX=\"$interp_prefix1\"" >> $config_target_mak
+echo "CONFIG_QEMU_INTERP_PREFIX=\"$interp_prefix1\"" >> $config_target_mak
 gdb_xml_files=""
 
 TARGET_ARCH="$target_arch2"