Clang compiler < 11.0 can't take parameter pack after a parameter with a default argument

Clang < 11.0 has a bug that it can't take parameter pack after a parameter with a default argument LINK. It was discover when testing spack LINK:

/tmp/root/spack-stage/spack-stage-pdiplugin-decl-netcdf-develop-vtwo75rwttw3r4r7t7nxfbk5vgiaunoa/spack-src/plugins/decl_netcdf/dnc_netcdf_file.cxx:104:78: error: missing default argument on parameter 'args'

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