Remove broken .clang-format symlink

[tallpants]

What does this PR do?
Removes the broken .clang-format symlink.

How should this be manually tested?
Nope, but you might need to commit a real .clang-format file.

Any background context you want to provide?
It was a symlink to a file on one of the dev's local machines, so there's really no reason at all to have it here. If you insist on having a .clang-format file in the repo we ought to commit a real one.

What are the relevant tickets?
No tickets.

Questions:

• Does the docs need an update? -- No
• Are there any security concerns? -- No
• Do we need to update engineering / success? -- No

[f2prateek]

This seems to break the CI build https://circleci.com/gh/segmentio/analytics-ios/5690

[tallpants]

@f2prateek could you commit the real .clang-format file to this branch? I think you have permission to push commits to it since you're a maintainer.

[tallpants]

I think that should fix the CI build.

[f2prateek]

Looks like the CI is still broken?

For reference, here's the file I had used https://github.com/square/spacecommander/blob/master/.clang-format

[f2prateek]

Seems like maybe we should use it via a submodule (https://github.com/square/spacecommander#details)