jgvariant-parent: Set -parameters compiler flag explicitly.

Change-Id: I890962555feb03560bf457aa02ce764fb735962c
diff --git a/jgvariant-parent/pom.xml b/jgvariant-parent/pom.xml
index f68b1c1..5444b7d 100644
--- a/jgvariant-parent/pom.xml
+++ b/jgvariant-parent/pom.xml
@@ -192,6 +192,7 @@
           <version>${compiler-plugin.version}</version>
           <configuration>
             <fork>true</fork>
+            <parameters>true</parameters>
             <showWarnings>true</showWarnings>
             <compilerArgs>
               <arg>-XDcompilePolicy=simple</arg>