make C++ language requirements optional #315
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This PR removes
CXXas a required language and makes it conditional on the availability of OpenCV. If examples are not requested (BUILD_EXAMPLES=OFF) or if OpenCV is not available (OpenCV_FOUNDis false), theCXXlanguage features will not be enabled and only the C language features will be required. This allows us to build the library and the basic example without a C++ compiler present.