Revert "Update dbfwfilter build configuration"

This reverts commit 09ef292283311483354e6cd628318a5cafd96b2c. The old
syntax is still required on SLES 11.

server/modules/filter/dbfwfilter/ruleparser.y

@@ -27,7 +27,7 @@
 %pure-parser
 
 /** Prefix all functions */
-%name-prefix "dbfw_yy"
+%name-prefix="dbfw_yy"
 
 /** The pure parser requires one extra parameter */
 %parse-param {void* scanner}