Improved c++14/17 integration, follows more closely modern cmake #175
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Currently xtensor-blas supports cmake prior to 3.8 by not using
target_compile_featuresto set the c++14/17 standard. This can be a problem when mixed with projects that do usetarget_compile_featuresto set the standard, because cmake will not match the two choices. Therefore with the current implementation, both flags may be effective at the same time, which can result in compiler options likewhere the later option wins.
If xtensor should continue to support cmake prior to 3.8, then I propose to use
target_compile_featureswhen a sufficiently recent cmake is found. Otherwise I'd recommend to set the minimum cmake to 3.8?