eclipse classpath: add external/hamcrest (used by mockito)

This fixes the "The hierarchy of the type is inconsistent" error
when using ArgumentMatcher from Mockito.

Change-Id: Ic5e74c7f7020a610fdb1c061a7eb3ecb4c487438
diff --git a/ide/eclipse/.classpath b/ide/eclipse/.classpath
index 3e30be1..678e817 100644
--- a/ide/eclipse/.classpath
+++ b/ide/eclipse/.classpath
@@ -130,6 +130,7 @@
 	<classpathentry kind="src" path="external/apache-http/src"/>
 	<classpathentry kind="src" path="external/bouncycastle/bcprov/src/main/java"/>
 	<classpathentry kind="src" path="external/guava/guava/src"/>
+	<classpathentry kind="src" path="external/hamcrest/src"/>
 	<classpathentry kind="src" path="external/junit/src"/>
 	<classpathentry kind="src" path="external/libphonenumber/java/src"/>
 	<classpathentry kind="src" path="external/mockito/src"/>