add rustfmt crlf files to root gitattributes

.gitattributes

@@ -16,3 +16,11 @@ config.toml.example linguist-language=TOML
 *.ico binary
 *.woff binary
 *.woff2 binary
+
+# Needed as part of converting rustfmt to a subtree, can hopefully be removed later.
+src/tools/rustfmt/tests/source/issue-3494/crlf.rs -text
+src/tools/rustfmt/tests/source/comment_crlf_newline.rs -text
+src/tools/rustfmt/tests/source/configs/enum_discrim_align_threshold/40.rs -text
+src/tools/rustfmt/tests/target/issue-3494/crlf.rs -text
+src/tools/rustfmt/tests/target/comment_crlf_newline.rs -text
+src/tools/rustfmt/tests/target/configs/enum_discrim_align_threshold/40.rs -text