build: force LF line endings so golden tests pass on Windows

Signed-off-by: Joshua Temple <joshua.temple@stablekernel.com>

Author: joshua-temple

.gitattributes

@@ -0,0 +1,5 @@
+# Normalize line endings to LF on checkout for every platform. Golden tests
+# compare serialized output (which uses \n) byte-for-byte against committed
+# fixtures; without this, Windows checks the fixtures out as CRLF and the
+# comparisons fail.
+* text=auto eol=lf