makepkg: output the name of the package being created

Although it should be currently quite obvious what package is being
created when "Creating package..." is printed, it will not be in the
future when a debug package is potentially created too.  Also, given
$pkgname is always correctly set when split packaging now, we no
longer need to pass that around.

Signed-off-by: Allan McRae <allan@archlinux.org>

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