set errors as warnings to true because the old version of the compile…

…r that we need to bootstrap now still had some bugs wrt type parameters

pom.xml

@@ -118,7 +118,7 @@
                 <artifactId>rascal-maven-plugin</artifactId>
                 <version>${rascal-maven.version}</version>
                 <configuration>
-                    <errorsAsWarnings>false</errorsAsWarnings> <!-- only allowed during intermediate bootstrap cycles -->
+                    <errorsAsWarnings>true</errorsAsWarnings> <!-- only allowed during intermediate bootstrap cycles -->
                     <bin>${project.build.outputDirectory}</bin>
                     <srcs>
                         <src>${project.basedir}/src/org/rascalmpl/library</src>