qt4: changed to use system sqlite if available

qt/qt4/qt4.conf

@@ -64,7 +64,7 @@ EOT
 confopt="-prefix $root/$prefix -bindir $root/$bindir -libdir $root/$libdir -docdir $root/$docdir -headerdir $root/$includedir -plugindir $root/$libdir/$pkg/plugins -datadir $root/$datadir -translationdir $root/$datadir/translations -sysconfdir $root/$sysconfdir -v"
 
 # What may come from system?
-for x in zlib libtiff libpng libmng libjpeg openssl nas; do
+for x in zlib libtiff libpng libmng libjpeg openssl nas sqlite; do
 	if pkginstalled $x; then
 		case "$x" in
 		openssl)	y='-openssl' ;;