Support a --delimiter option to the ldlibpath and exepath commands.
Notable use case are the JW_PKG_XXX_PATH variables, which should use
spaces instead of colons.
TODO: Merging those two command modules with BaseCmdPkgRelations
would have made introducing this redundancy unnecessary, check if
that's a possibility.
Signed-off-by: Jan Lindemann <jan@janware.com>