Update of NetCDF_jll to use stdlib libcurl and MbedTLS in julia 1.6

[Alexander-Barth]

Currently NetCDF_jll cannot be loaded in julia 1.6 beta1 because it has been build using an older version of libcurl/MbedTLS (compared to the version of these library that are used in julia 1.6) as described in JuliaLang/julia#39015 .

julia> using NetCDF_jll
ERROR: InitError: could not load library "/home/ulg/gher/abarth/.julia/artifacts/877149aedda703fde4a848bffd955df8934ca876/lib/libnetcdf.so"
libmbedtls.so.12: cannot open shared object file: No such file or directory
Stacktrace: [...]

I tried to make this change as described here:
JuliaLang/julia#39015 (comment)

but the build process of NetCDF did not find libcurl. I am not sure what is the correct way to tell to BinaryBuilder to use a library bundeld with julia. Besides the lib*.so files the build process would also need the header files (at least curl.h, I think).

Maybe @visr or @giordano have an idea?
Many thanks!

[visr]

Not sure if it would help, but you could try submitting a PR with your changes, to see if the same things happen on the buildbots. Then you can directly add the julia_compat="1.6" kwarg to build_tarballs, since it would make the new build for julia 1.6+ only (like the version of LibCURL_jll it requires).

[visr]

Fixed by #2402, #2453, #2454.