build: define _DARWIN_USE_64_BIT_INODE=1 on OS X

Fixes a segmentation fault on some OS X systems due to sizeof(struct stat)
mismatches.

Fixes #2061.

common.gypi

@@ -152,6 +152,7 @@
         ],
       }],
       ['OS=="mac"', {
+        'defines': ['_DARWIN_USE_64_BIT_INODE=1'],
         'xcode_settings': {
           'ALWAYS_SEARCH_USER_PATHS': 'NO',
           'GCC_CW_ASM_SYNTAX': 'NO',                # No -fasm-blocks