NetCDF 4.3.1.1

I've updated NetCDF to the newest release. This has the added benefit of removing the patch from `ncgen3`, which has been merged upstream. Note that on my machine, I had to `--disable-dap-remote-tests` as two tests failed, I see intermitted reports of others having this problem as well, but didn't include this in this formula update as I'm not certain its a recurrent issue. Also note that Unidata doesn't directly provide SHA1 sums, so I computed this against my local copy (as had been done in previous versions of this formula).