clang-format will modify non source files and has no configuration
options to ignore bash, python, or extensionless files. This CL is a
follow up for:

https://swiftshader-review.googlesource.com/c/git-hooks/+/54569

Bug: b/187094215
Change-Id: I72953bd07e3c16b70aab441a25c27abae31b6a87
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/54689
Kokoro-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Commit-Queue: Sean Risser <srisser@google.com>
Tested-by: Sean Risser <srisser@google.com>