[generator.c.tests] added classpath entries for Xtext 2.8

Change-Id: I17194c2b8c3ef569a36ffad99b47d9859b721573
diff --git a/tests/org.eclipse.etrice.generator.c.tests/make.xml b/tests/org.eclipse.etrice.generator.c.tests/make.xml
index 697c7e5..0ea5281 100644
--- a/tests/org.eclipse.etrice.generator.c.tests/make.xml
+++ b/tests/org.eclipse.etrice.generator.c.tests/make.xml
@@ -145,6 +145,13 @@
 				<include name="org.eclipse.xtend.lib_2.7*.jar" />
 				<include name="org.eclipse.xtext.xbase.lib_2.7*.jar" />
 				
+				<!-- Xtext 2.8 -->
+				<include name="org.eclipse.xtext_2.8*.jar" />
+				<include name="org.eclipse.xtext.util_2.8*.jar" />
+				<include name="org.eclipse.xtext.common.types_2.8*.jar" />
+				<include name="org.eclipse.xtend.lib_2.8*.jar" />
+				<include name="org.eclipse.xtext.xbase.lib_2.8*.jar" />
+				
 				<include name="org.apache.log4j_1.2*.jar" />
 				<include name="org.antlr.runtime_3.2*.jar" />
 				<include name="javax.inject_1.0*.jar" />