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libccrtp was depending on commoncpp2, and have been replaced by a version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/libccrtp/sources/w32/cape/.cvsignore b/jni/libccrtp/sources/w32/cape/.cvsignore
new file mode 100644
index 0000000..4631ae0
--- /dev/null
+++ b/jni/libccrtp/sources/w32/cape/.cvsignore
@@ -0,0 +1,5 @@
+Debug
+Release
+ccrtp1.opt
+ccrtp1.plg
+rtphello.plg
\ No newline at end of file