Remove stray temporary file

This was checked in as part of
https://boringssl-review.googlesource.com/c/boringssl/+/101547 but
shouldn't have been.

Change-Id: If3e37ba6e50da5a5623004b5e103698056addf16
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/102007
Reviewed-by: Adam Langley <agl@google.com>
Presubmit-BoringSSL-Verified: boringssl-scoped@luci-project-accounts.iam.gserviceaccount.com <boringssl-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: David Benjamin <davidben@google.com>
Commit-Queue: Adam Langley <agl@google.com>
diff --git a/build.json.tmp b/build.json.tmp
deleted file mode 100644
index e69de29..0000000
--- a/build.json.tmp
+++ /dev/null