Issue 321 - libadblockplus build fails on OS X (tr1/memory.h not found)

common.gypi

 {
   'variables': {
     'visibility%': 'hidden',
     'library%': 'static_library',
     'component%': '',
     'want_separate_host_toolset': 0,
   },
 
   'conditions': [
     ['OS=="linux" or OS=="freebsd" or OS=="openbsd" or OS=="solaris" \
        or OS=="netbsd" or OS=="android"', {
       'target_defaults': {
         'cflags': [ '-Wall', '-W', '-Wno-unused-parameter',
                     '-Wnon-virtual-dtor', '-pthread', '-fno-rtti',
                     '-pedantic', '-std=c++0x', '-fexceptions', ],
         'ldflags': [ '-pthread', ],
       },
     }],
+    ['OS=="mac"', {
+      'xcode_settings': {
+        'CLANG_CXX_LANGUAGE_STANDARD': 'c++0x',
+        'CLANG_CXX_LIBRARY': 'libstdc++',
+        'OTHER_CPLUSPLUSFLAGS' : ['-std=c++0x', '-stdlib=libstdc++'],
+      },
+    }],
     ['OS=="android"', {
       'target_defaults': {
         'cflags!': [
           '-pthread',  # Not supported by Android toolchain.
         ],
         'ldflags!': [
           '-pthread',  # Not supported by Android toolchain.
         ],
       },
     }],
   ],
 
   'target_defaults': {
     'msvs_cygwin_shell': 0,
   }
 }