Allow fallback to find_library/find_path for netcdf #25
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If netcdf libs are not installed as cmake packages, the call to find_package may fail (it depends on which FindNetCDF.cmake script is picked up, I think).
I'm not sure if this PR is desired, but on my laptop I can't get CIME to build cprnc without these mods. For some reason, the call to find_package fails. Setting CMAKE_FIND_DEBUG_MODE=ON, I can see that it doesn't use any FindNetCDF.cmake module, and therefore it can only rely on NetCDFConfig.cmake (and similar) files, which do not exist in my installation.
This PR allows us to still find netcdf if libs/includes are there, but we don't have the cmake config file. We simply look for libs/includes separately, then create the interface target.