Fix backwards compatibility tests on Windows. (#595)

* Treat backwards compatibility arrays as binary files.

* Remove redundant README.

* Stop skipping tests on Windows.

* Fix wildcard.

* Treat all test data as binary.

Author: teo-tsirpanis

.gitattributes

@@ -1,2 +1,4 @@
 .git_archival.txt  export-subst
 *.qmd linguist-language=RMarkdown
+backwards-compatibility-data/data/**/* binary
+external/test-data/**/* binary

backwards-compatibility-data/data/README.md

@@ -89,16 +89,6 @@ TEST_CASE("test_query_old_indices", "[backwards_compatibility]") {
         continue;
       }
 
-      // Skip pre-0.16.0 versions on Windows due to blosc1/blosc2
-      // incompatibility. TileDB 2.30.0+ uses blosc2, but older test data was
-      // compressed with blosc1. blosc2 has a Windows-specific bug when
-      // decompressing blosc1 data.
-#ifdef _WIN32
-      if (index_uri.find("0.16.0") == std::string::npos) {
-        continue;
-      }
-#endif
-
       auto read_group = tiledb::Group(ctx, index_uri, TILEDB_READ, cfg);
       std::vector<float> expected_distances(query_indices.size(), 0.0);
       if (index_uri.find("ivf_flat") != std::string::npos) {