bugfix: config: we should always use double quotes in [...] conditionals.

Author: agentzh

config

@@ -40,7 +40,7 @@ if [ ! -z "$HTTP_POSTPONE" ]; then
     fi
 
     # This module depends upon the postpone filter being activated
-    if [ $HTTP_POSTPONE != YES ]; then
+    if [ "$HTTP_POSTPONE" != YES ]; then
         HTTP_FILTER_MODULES="$HTTP_FILTER_MODULES $HTTP_POSTPONE_FILTER_MODULE"
         HTTP_SRCS="$HTTP_SRCS $HTTP_POSTPONE_FILTER_SRCS"
         HTTP_POSTPONE=YES