treewide: Various fixes for clang compilation

Change-Id: I37e53e3854687ffeb146db515c2de69b2e6ac02d
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/test/meson.build b/test/meson.build
index 01104c5..8403e0f 100644
--- a/test/meson.build
+++ b/test/meson.build
@@ -98,6 +98,7 @@
         t.underscorify(), t + '.cpp',
         build_by_default: false,
         implicit_include_directories: false,
+        cpp_args: '-Wno-missing-braces',
         dependencies: deps))
   endforeach
 endif