build: add extra semi check

PR-URL: https://github.com/nodejs/node/pull/46194
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Darshan Sen <raisinten@gmail.com>

node.gyp

@@ -96,6 +96,7 @@
         '-W',
         '-Wno-unused-parameter',
         '-Werror=undefined-inline',
+        '-Werror=extra-semi',
       ],
     },
 

node.gypi

@@ -27,7 +27,7 @@
 
   'conditions': [
     [ 'clang==1', {
-      'cflags': [ '-Werror=undefined-inline', ]
+      'cflags': [ '-Werror=undefined-inline', '-Werror=extra-semi']
     }],
     [ '"<(_type)"=="executable"', {
       'msvs_settings': {