Clang format config for Weston

[Harish Krupo]

Hi,

I have written a clang format file based on this example [1], to
match the coding style here [2]. Does the below config look okay or
should something be changed?
If people are interested, I can open a MR for this. This could also be
used in the CI to warn/abort if a patch isn't according to the coding
style.

The config:
BasedOnStyle: LLVM
IndentWidth: 8
TabWidth: 8
UseTab: Always
BreakBeforeBraces: Linux
AllowShortIfStatementsOnASingleLine: false
IndentCaseLabels: false
AlwaysBreakAfterReturnType: TopLevel

[1] https://clang.llvm.org/docs/ClangFormatStyleOptions.html#examples
[2] https://gitlab.freedesktop.org/wayland/weston/blob/master/CONTRIBUTING.md#coding-style