This commit readd ${VA_LIBRARIES} ${VA_INTEL_LIBRARIES}
that was missed in commit 2200e13c

    diff --git a/samples/va_intel/CMakeLists.txt b/samples/va_intel/CMakeLists.txt
    -    ocv_target_link_libraries(${the_target} ${OPENCV_LINKER_LIBS} ${OPENCV_VA_INTEL_SAMPLES_REQUIRED_DEPS} ${VA_LIBRARIES} ${VA_INTEL_LIBRARIES})
    +  ocv_target_link_libraries(${tgt} ${OPENCV_LINKER_LIBS} ${OPENCV_VA_INTEL_SAMPLES_REQUIRED_DEPS})

- allow installing samples sources on all platforms
  even if BUILD_EXAMPLES is disabled,  fixed minor
  issues in sources installation process
- use 'example_<group>_<name>' scheme for target and binary file naming
- use single function for sample executable creation

removed unused context_id2; changed blur size 7x7 to 3x3; added short comments
removed unnecessary call to convertFromVASurface()
replaced dumpSurface() with writeImage()
added infile cmdline parameter, input image loaded by imread()

fixed trailing whitespaces
renamed files *vaapi* to *va_intel*
changed names vaapi* to va_intel*