test.run: build vfs plugins of in rom list

repos/os/run/test.run

@@ -223,7 +223,14 @@ foreach rom [content_rom_modules] {
 
 	# raw-archive content is installed directly into [run_dir]/genode
 	if {![rom_module_from_raw_archive $rom]} {
-		lappend boot_modules $rom }
+		lappend boot_modules $rom
+	}
+
+	# handle vfs plugin shared-object targets
+	if {[regexp "^vfs_(.+).lib.so$" $rom dummy plugin]} {
+		lappend build_targets lib/vfs/$plugin
+		continue
+	}
 
 	if {[info exists src_sub_dir($rom)]} {
 		lappend build_targets $src_sub_dir($rom)