UseJava: add INCLUDE_MODULES argument to add_jar

Arguments are added to the dependencies list, and to the "--module-path"
passed to javac, which is only generated for adequate JDK versions.

Tests/JavaModExportImport/BuildExport/module-info.java

@@ -0,0 +1,3 @@
+module mod_foo {
+    exports org.foo;
+}