List a jitsi-specific version of jitsi/libjitsi

We made an effort to support reproducible builds. That made us specify
explicit jitsi/libjitsi and jitsi/jitsi-universe (artifact) versions.
The jitsi Maven project is the only one which did not specify an
explicit jitsi/libjitsi version. However, jitsi/jitsi-videobridge
depends on jitsi/jitsi and, consequently, sees a mixture of
jitsi/libjitsi and jitsi/jitsi-universe versions during its build.

m2/pom.xml

@@ -44,6 +44,16 @@
     <module>jitsi-version</module>
   </modules>
 
+  <dependencyManagement>
+    <dependencies>
+      <dependency>
+        <groupId>${project.groupId}</groupId>
+        <artifactId>libjitsi</artifactId>
+        <version>1.0-20160202.214638-87</version>
+      </dependency>
+    </dependencies>
+  </dependencyManagement>
+
   <build>
     <sourceDirectory>../../src</sourceDirectory>
     <pluginManagement>