Add support for curl in createJMHBundle.sh

[Eirik Bjørsnøs]

Hi,

The following PR adds support for running createJMHBundle.sh on MacOS,
where wget is not installed by default:

https://github.com/openjdk/jdk/pull/12164

I would appreciate help in creating a JBS issue for this PR, since I'm
not an Author.

Thanks,
Eirik.