Don't show CRLF tests as modified in the working directory

jyn514 · calebcartwright · commit 6767c1d0517f · 2021-04-21T21:17:36.000-05:00
This was being overriden by `lf=eof` in `.gitattributes` in the root
directory. Override it again to avoid warnings like this:

```
$ git diff src/tools/rustfmt/tests/target/issue-3494/crlf.rs
warning: CRLF will be replaced by LF in src/tools/rustfmt/tests/target/issue-3494/crlf.rs.
The file will have its original line endings in your working directory
```
diff --git a/.gitattributes b/.gitattributes
@@ -0,0 +1,2 @@
+# Stop git from showing CRLF tests as modified
+* eol=Unset

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+# Stop git from showing CRLF tests as modified`
	`2`	`+* eol=Unset`