Revert "build: compile with -D__DARWIN_64_BIT_INO_T on OS X"

This reverts commit 01fbe7bf37.

__DARWIN_64_BIT_INO_T is a no-op in most cases and might be actively harmful in
some others.

config-unix.mk

@@ -50,7 +50,6 @@ endif
 ifeq (Darwin,$(uname_S))
 EV_CONFIG=config_darwin.h
 EIO_CONFIG=config_darwin.h
-CPPFLAGS += -D__DARWIN_64_BIT_INO_T=1
 CPPFLAGS += -Isrc/ares/config_darwin
 LINKFLAGS+=-framework CoreServices
 OBJS += src/unix/darwin.o

uv.gyp

@@ -9,9 +9,6 @@
           'EIO_STACKSIZE=262144'
         ],
         'conditions': [
-          ['OS=="mac"', {
-            'defines': ['__DARWIN_64_BIT_INO_T=1'],
-          }],
           ['OS=="solaris"', {
             'cflags': ['-pthreads'],
             'ldlags': ['-pthreads'],