Simplifies cross compilation with CUDA for ARM boards. CUDA arch is set for all ARM targets, --unresolved-symbols=ignore-in-shared-libs is set when cross-compiling for ARM and FindCUDA.cmake was adjusted to find shared library stubs within the CUDA toolkit.

QSlider does not have getMinimum/Maximum getters. Probably was not
compile tested.

fixed typo

The 12 and 16 arguments Matx constructors differs from all others,
leaving values initialized and requiring the argument number to be equal
to the channels number.

allows disabling automatic conversion to RGB for certain formats. If
conversion is disabled the returned image just points to the underlying
buffer, so no memcpy is performed.

Note that we do not check image size in retrieve frame any more as it
can not possibly while the device is streaming.
Furthermore this code was disabled altogether by the wrong ifdef in the
previous commit.

in the case of HAVE_CAMV4L2 && !HAVE_CAMV4L there was no body for the if
statement.

they are upstream since at least linux 2.6.8 (10 Years)
http://lxr.oss.org.cn/ident?v=2.6.8&i=V4L2_PIX_FMT_SBGGR8