Add "com.ibm.wala.core.testdata" to classpath for testing

This lets the "DynamicCallGraphTest" tests pass.  The tests in that
class expect to find some element of the classpath that includes the
substring "com.ibm.wala.core.testdata".  They then treat that as a
collection of bytecode files to instrument.

com.ibm.wala.core.tests/build.gradle

@@ -23,6 +23,7 @@ dependencies {
 
 processTestResources {
 	def testdata = project(':com.ibm.wala.core.testdata')
+	dependsOn testdata.compileTestJava
 	dependsOn testdata.extractBcel
 	dependsOn testdata.verifyJavaCup
 
@@ -37,9 +38,9 @@ test {
 	maxHeapSize = '800M'
 	systemProperty 'com.ibm.wala.junit.analyzingJar', 'true'
 	systemProperty 'com.ibm.wala.junit.profile', 'short'
+	classpath += files project(':com.ibm.wala.core.testdata').sourceSets.test.java.outputDir
 
 	// https://github.com/liblit/WALA/issues/5
-	exclude '**/DynamicCallGraphTest.class'
 	exclude '**/PruneArrayOutOfBoundExceptionEdge.class'
 }