Adds parameter option -i to specify the type of package to be build.
Adds -b parameter to pass breakpad URL.
Also adds a way to overwrite the macOS kernel version via environment
variable, which can be useful if someone wants to use an older contribs
package.

(cherry picked from commit 85975db4a8e3bcdad840277cd82d72c3e85f778e)
Signed-off-by: David Fuhrmann <dfuhrmann@videolan.org>