chore: add stack-protector-strong flag (#880)

Author: rzhao271

binding.gyp

@@ -9,24 +9,26 @@
           'SpectreMitigation': 'Spectre'
         },
         'msvs_settings': {
-            'VCCLCompilerTool': {
-              'AdditionalOptions': [
-                '/guard:cf',
-                '/sdl',
-                '/W3',
-                '/we4146',
-                '/we4244',
-                '/we4267',
-                '/ZH:SHA_256'
-              ]
-            },
-            'VCLinkerTool': {
-              'AdditionalOptions': [
-                '/DYNAMICBASE',
-                '/guard:cf'
-              ]
-            }
+          'VCCLCompilerTool': {
+            'AdditionalOptions': [
+              '/guard:cf',
+              '/sdl',
+              '/W3',
+              '/we4146',
+              '/we4244',
+              '/we4267',
+              '/ZH:SHA_256'
+            ]
           },
+          'VCLinkerTool': {
+            'AdditionalOptions': [
+              '/DYNAMICBASE',
+              '/guard:cf'
+            ]
+          }
+        },
+      }, {
+        'cflags': ['-O2', '-fstack-protector-strong'],
       }],
     ],
   },
@@ -60,7 +62,7 @@
           'libraries': [
             '-lutil'
           ],
-          'cflags': ['-Wall', '-O2'],
+          'cflags': ['-Wall'],
           'ldflags': [],
           'conditions': [
             # http://www.gnu.org/software/gnulib/manual/html_node/forkpty.html