FS-9093: mod_cv: remove unneeded includes

FS-9093: mod_cv: remove unneeded includes

OpenCV contains various modules which have inter-module dependencies.
While including freeswitch into buildroot we stumbled over the fact
that mod_cv.cpp includes more headers than needed[1].
hese OpenCV headers are generic headers which require more OpenCV
modules enabled than really used by Freeswitch.
This patch fixes the problem.

[1] http://article.gmane.org/gmane.comp.lib.uclibc.buildroot/146662

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>