Migrate `tools/bazel.rc` to `.bazelrc`

Since [1], Bazel changed the list of resource file locations.
Adapt to that list and move `%workspace%/tools/bazelrc` to
`%workspace%/.bazelrc`.

[1] https://github.com/bazelbuild/bazel/commit/ec83598

Change-Id: Ifb24bdb6680fa597a577ad944a2c0d14f3354c34
1 file changed