Adjust Build.rakumod directories & n-path

[librasteve]

const $dev-path = $*HOME.add('.myapp');

sub isNativeForMyapp {
my $resource-name = "foobar";
my $path = $dev-path.add($resource-name);
if not $path.exists { $path.spurt(%?RESOURCES{$resource-name}.slurp(); };
return $lib
};

sub needs-naitve-lib is native(&isNativeForMyapp)

per ugexe advice