Support --with-pkgversion and --with-bugurl

[Roland McGrath]

> This *is* related: the code previously used PACKAGE, which uses 
> _libc_intl_domainname, and the patch makes it use PKGVERSION instead, 
> which will always be a string constant, so defining _libc_intl_domainname 
> for cross-rpcgen is no longer needed after the patch, but is needed before 
> the patch.  While it could go in separately after the main pkgversion 
> changes (but not before them), splitting it out like that seems pointless 
> to me.

I see.  It's fine then.