* scripts/dpkg-architecture.pl: Use get_valid_arches instead of

	* scripts/dpkg-architecture.pl: Use get_valid_arches instead of
	directly using @os and @cpu variables.
	($pkgdatadir): Change from a 'my' to an 'our' variable.
	(@cpu, @os, %cputable, %ostable, %cputable_re, %ostable_re,
	read_cputable, read_ostable, split_debian, debian_to_gnu,
	split_gnu, gnu_to_debian): Move to ...
	* scripts/controllib.pl: ... here.
	($pkgdatadir): Declare as 'our'.
	(get_valid_arches): New function.