meson: Enable -Wextra-semi for clang

The option, -Wextra-semi, helps developers to find unnecessary
semicolons. This option is available with clang.

Signed-off-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

meson.build

@@ -64,6 +64,10 @@ if cc.get_id() == 'clang'
             '-stdlib=libc++',
         ]
     endif
+
+    cpp_arguments += [
+        '-Wextra-semi',
+    ]
 endif
 
 if cc.get_id() == 'gcc'