v8: reapply floating patches

Note that 26f754d9 ('fix error handling in SendConnectMessage') is no
longer necessary; it was properly fixed upstream in V8 r11609.

deps/v8/build/common.gypi

@@ -324,7 +324,7 @@
         },
         'conditions': [
           ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="netbsd"', {
-            'cflags': [ '-Wall', '<(werror)', '-W', '-Wno-unused-parameter',
+            'cflags': [ '-Wno-unused-parameter',
                         '-Wnon-virtual-dtor', '-Woverloaded-virtual' ],
           }],
         ],