Fixing Mojave's brew install of netcdf

homebrew does not yet officially supports OSX 10.14 -Mojave-.

As such, its netcdf install is broken.

Fix

Mojave tends to drop 32bits supports. As such, the way introspecting binaries has changed.

Fix it as follows:

$ brew edit netcdf

Comment out (with a BOL #)

# SIP causes system Python not to play nicely with @rpath
# libnetcdf = (lib/"libnetcdf.dylib").readlink
# %w[libnetcdf-cxx4.dylib libnetcdf_c++.dylib].each do |f|
#   macho = MachO.open("#{lib}/#{f}")
#   macho.change_dylib("@rpath/#{libnetcdf}",
#   macho.write!
# end