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libccrtp was depending on commoncpp2, and have been replaced by a version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/inc/Makefile.am b/jni/libucommon/sources/inc/Makefile.am
new file mode 100644
index 0000000..e7cc364
--- /dev/null
+++ b/jni/libucommon/sources/inc/Makefile.am
@@ -0,0 +1,17 @@
+# Copyright (C) 2006-2010 David Sugar, Tycho Softworks.
+#
+# This file is free software; as a special exception the author gives
+# unlimited permission to copy and/or distribute it, with or without
+# modifications, as long as this notice is preserved.
+#
+# This program is distributed in the hope that it will be useful, but
+# WITHOUT ANY WARRANTY, to the extent permitted by law; without even the
+# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+
+MAINTAINERCLEANFILES = Makefile.in Makefile
+RELEASE = $(LT_VERSION) -release $(LT_RELEASE)
+AM_CXXFLAGS = $(UCOMMON_FLAGS)
+EXTRA_DIST = *.cmake
+
+SUBDIRS = ucommon commoncpp
+