encoding/protobuf: remove test binary

Change-Id: I0794fe3c5cafd8233bf5f98ffeabb1795a1c1769
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/2360
Reviewed-by: Marcel van Lohuizen <mpvl@golang.org>
diff --git a/encoding/protobuf/debug.test b/encoding/protobuf/debug.test
deleted file mode 100755
index 2c13ead..0000000
--- a/encoding/protobuf/debug.test
+++ /dev/null
Binary files differ