Source release 15.1.0

third_party/protobuf.gypi

@@ -58,6 +58,7 @@
       '-Wno-invalid-offsetof',
       '-Wno-cast-qual',
       '-Wno-ignored-qualifiers',
+      '-Wno-inconsistent-missing-override',
     ],
     'excluded_cflags': [
       # In addition to turning these off above, GYP's order-of-operations means
@@ -69,6 +70,7 @@
       '-Winvalid-offsetof',
       '-Wcast-qual',
       '-Wignored-qualifiers',
+      '-Winconsistent-missing-override',
     ],
   },
   'target_defaults': {
@@ -84,10 +86,8 @@
     'cflags_cc!': ['<@(excluded_cflags)'],
     'msvs_settings': {
       'VCCLCompilerTool': {
-        'DisableSpecificWarnings': [
-          '4005',  # Duplicate #define with WIN32_LEAN_AND_MEAN.
-          '4506',  # Missing definition of inline template.
-        ],
+        # Disable warnings for third-party code.
+        'WarningLevel': '0',
       },
     },
   },