hdf4: remove bin/ncgen for compatibility with netcdf
hdf4: remove bin/ncgen for compatibility with netcdf

Closes #1348.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

DomT4/homebrew-versions,coeligena/homebrew-verscustomized,heuermh/homebrew-versions