nuttcp: add tarball hash
Fixes (eventually, once the bad downloads are deleted):
http://autobuild.buildroot.net/results/055/
0556ffec533af65392c24f7c74092d3282245c95/
http://autobuild.buildroot.net/results/481/
4810de845bac9ec28cba86379de0f8c554038ea0/
http://autobuild.buildroot.net/results/384/
384b627a104793f460072aa43381a8c2d703a693/
http://autobuild.buildroot.net/results/2f8/
2f8574a5bc692e3dfb803b420fb6ae2dc420cfed/
And many others.
There's no upstream hash, but this matches E.G. Freebsd:
http://lists.freebsd.org/pipermail/freebsd-ports-bugs/2009-August/170685.html
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>