pkg/path/testdata: move files to minimize diffs

These files have to be moved as Go will compile them
only on the respective OS. The windows test needs to
remain only for windows, as it contains a Windows
syscall. This is only for testing: the Windows logic
does not use it and is fully hermetic.

Change-Id: Iff73114c4433b62eee26c9e8c8d4c4d3505f4468
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/7844
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/pkg/path/testdata/example_unix_test.go b/pkg/path/testdata/example_nix_test.go
similarity index 100%
rename from pkg/path/testdata/example_unix_test.go
rename to pkg/path/testdata/example_nix_test.go
diff --git a/pkg/path/testdata/path_unix.go b/pkg/path/testdata/path_nix.go
similarity index 100%
rename from pkg/path/testdata/path_unix.go
rename to pkg/path/testdata/path_nix.go
diff --git a/pkg/path/testdata/path_plan9.go b/pkg/path/testdata/path_p9.go
similarity index 100%
rename from pkg/path/testdata/path_plan9.go
rename to pkg/path/testdata/path_p9.go
diff --git a/pkg/path/testdata/path_windows.go b/pkg/path/testdata/path_win.go
similarity index 100%
rename from pkg/path/testdata/path_windows.go
rename to pkg/path/testdata/path_win.go