Patches floating on V8

Only SConstruct and build/common.gypi at this point.  All
others are accepted upstream, which greatly simplifies things.

deps/v8/SConstruct

@@ -293,7 +293,6 @@ V8_EXTRA_FLAGS = {
   'gcc': {
     'all': {
       'WARNINGFLAGS': ['-Wall',
-                       '-Werror',
                        '-W',
                        '-Wno-unused-parameter',
                        '-Wnon-virtual-dtor']
@@ -390,7 +389,7 @@ MKSNAPSHOT_EXTRA_FLAGS = {
 DTOA_EXTRA_FLAGS = {
   'gcc': {
     'all': {
-      'WARNINGFLAGS': ['-Werror', '-Wno-uninitialized'],
+      'WARNINGFLAGS': ['-Wno-uninitialized'],
       'CCFLAGS': GCC_DTOA_EXTRA_CCFLAGS
     }
   },

deps/v8/build/common.gypi

@@ -352,7 +352,6 @@
           }],  # OS=="mac"
           ['OS=="win"', {
             'msvs_configuration_attributes': {
-              'OutputDirectory': '<(DEPTH)\\build\\$(ConfigurationName)',
               'IntermediateDirectory': '$(OutDir)\\obj\\$(ProjectName)',
               'CharacterSet': '1',
             },