try to update build dep

Author: targos

deps/v8/DEPS

@@ -72,7 +72,7 @@ vars = {
 
 deps = {
  'v8/build':
- Var('chromium_url') + '/chromium/src/build.git' + '@' + '1b904cc30093c25d5fd48389bd58e3f7409bcf80',
+ Var('chromium_url') + '/chromium/src/build.git' + '@' + '1cb6993e286e4c65bf19da16adb8a39584d6d598',
  'v8/third_party/depot_tools':
  Var('chromium_url') + '/chromium/tools/depot_tools.git' + '@' + '454f4ba4b3a69feb03c73f93d789062033433b4c',
  'v8/third_party/icu':