cmd/go: remove file created by test

The file cmd/go/testdata/src/testcache/script.sh was accidentally
committed with CL 83256. Sorry about that.

Updates #22593

Change-Id: Id8f07587ea97015ed75439db220560a5446e53e6
Reviewed-on: https://go-review.googlesource.com/83395
Reviewed-by: Russ Cox <rsc@golang.org>

diff --git a/src/cmd/go/testdata/src/testcache/script.sh b/src/cmd/go/testdata/src/testcache/script.sh
deleted file mode 100755 (executable)
index 039e4d0..0000000
--- a/src/cmd/go/testdata/src/testcache/script.sh
+++ /dev/null
@@ -1,2 +0,0 @@
-#!/bin/sh
-exit 0