dspam: fixed to check if a needed package is effectively installed before enabling the coresponding storage driver

mail/dspam/dspam.conf

@@ -39,7 +39,7 @@ var_append confopt ' ' "--with-dspam-owner=dspam"
 var_append confopt ' ' "--with-dspam-group=dspam"
 
 for x in postgresql:pgsql mysql:mysql; do
-	if pkginstalled "${x%:*}"; then
+	if pkginstalled -f "${x%:*}"; then
 		pkgprefix -t "${x%:*}"
 		var_append confopt ' ' "--with-${x#*:}-includes=$root$( pkgprefix includedir ${x%:*} )"
 		var_append confopt ' ' "--with-${x#*:}-libraries=$root$( pkgprefix libdir ${x%:*} )"
@@ -49,7 +49,7 @@ for x in postgresql:pgsql mysql:mysql; do
         fi
 done
 
-if pkginstalled sqlite; then
+if pkginstalled -f sqlite; then
         pkgprefix -t sqlite
         var_append confopt ' ' "--with-sqlite-includes=$root$( pkgprefix includedir sqlite )"
         var_append confopt ' ' "--with-sqlite-libraries=$root$( pkgprefix libdir sqlite )"