The opencv element includes were full of duplicates and uneeded headers.
For example a few elements that stopped using gstcvopencvutils still
included that header file.
Change the file extension to cpp and add it into Makefile for consistency
with other elements of opencv and because Opencv not support C language in
new API 2.4.11.
https://bugzilla.gnome.org/show_bug.cgi?id=754148