Update native image args

* `--allow-incomplete-classpath` is now default.
* `VersionEnum` is now loaded during build time.
* Native image now runs on the module path, obviously missing an export
  (see also: oracle/graal#4468)

pom.xml

@@ -198,8 +198,9 @@
 					<javaStaticSdkVersion>${java.version}</javaStaticSdkVersion>
 					<javafxStaticSdkVersion>${javafx.version}</javafxStaticSdkVersion>
 					<nativeImageArgs>
-						<arg>--allow-incomplete-classpath</arg>
+						<arg>--add-exports=org.graalvm.nativeimage.builder/com.oracle.svm.core.jdk.proxy=ALL-UNNAMED</arg>
 						<arg>--initialize-at-build-time=org.pdfclown.Version</arg>
+						<arg>--initialize-at-build-time=org.pdfclown.VersionEnum</arg>
 						<arg>--no-fallback</arg>
 					</nativeImageArgs>
 				</configuration>