linux: Suppress compiler warnings of breakpad.

common.gypi

@@ -110,6 +110,8 @@
         ],
       }],
       ['_target_name.startswith("breakpad") or _target_name in ["crash_report_sender", "dump_syms"]', {
+        'conditions': [
+          ['OS=="mac"', {
             'xcode_settings': {
               'WARNING_CFLAGS': [
                 '-Wno-deprecated-declarations',
@@ -117,6 +119,13 @@
                 '-Wno-unused-function',
               ],
             },
+          }],  # OS=="mac"
+          ['OS=="linux"', {
+            'cflags': [
+              '-Wno-empty-body',
+            ],
+          }],  # OS=="linux"
+        ],
       }],
     ],
     'msvs_cygwin_shell': 0, # Strangely setting it to 1 would make building under cygwin fail.