Update clang tools to version 11+ (#87)

Co-authored-by: Sebastian Nickolls <sebastian.nickolls@arm.com>
diff --git a/test/test-api.cc b/test/test-api.cc
index b30230d..dfb61af 100644
--- a/test/test-api.cc
+++ b/test/test-api.cc
@@ -29,9 +29,8 @@
 #include <sstream>
 #include <vector>
 
-#include "test-runner.h"
-
 #include "cpu-features.h"
+#include "test-runner.h"
 #include "utils-vixl.h"
 
 #if __cplusplus >= 201103L