C stubs: add a .clang-format

We may intend to upstream the xenctrlext stubs to Xen, so it should follow
the Xen CODING_STYLE.
The .clang-format here is based on a version I sent upstream that tries to
follow that coding style.

Signed-off-by: Edwin Török <[email protected]>

Author: edwintorok

.clang-format

@@ -0,0 +1,9 @@
+BasedOnStyle: GNU
+IndentWidth: 4
+
+# override GNU to match Xen ../../CODING_STYLE more closely
+AlwaysBreakAfterDefinitionReturnType: None
+AlwaysBreakAfterReturnType: None
+SpacesInConditionalStatement: true
+SpaceBeforeParens: ControlStatements
+BreakBeforeBraces: Allman

Makefile

@@ -81,6 +81,7 @@ doc-json:
 
 format:
 	dune build @fmt --auto-promote
+	git ls-files '*.c' '*.h' | xargs clang-format -i
 
 .PHONY: quality-gate
 quality-gate: