Switch commoncpp2 to ucommon to solve dependency conflicts.
libccrtp was depending on commoncpp2, and have been replaced by a version
depending on ucommon as well.
diff --git a/jni/libucommon/sources/AUTHORS b/jni/libucommon/sources/AUTHORS
new file mode 100644
index 0000000..e087ab0
--- /dev/null
+++ b/jni/libucommon/sources/AUTHORS
@@ -0,0 +1,8 @@
+Authors of GNU uCommon.
+
+David Sugar <dyfet@gnutelephony.org> designed and implemented commoncpp & ucommon
+Eric Schendel <esche@users.sourceforge.net> recent improvements on the serial
+I/O classes
+Angelo Naselli <anaselli at linux dot it> as contributor and for bug fixing
+Leandro Melo de Sales <leandroal@gmail.com> as contributor for DCCP socket support
+