Roll external/abseil_cpp/ c7cf999bd..742a0ed42 (5 commits)

abseil/abseil-cpp@c7cf999...742a0ed

Created with:
  roll-dep external/abseil_cpp

DEPS

@@ -3,7 +3,7 @@ use_relative_paths = True
 vars = {
   'github': 'https://github.com',
 
-  'abseil_revision': 'c7cf999bda8390d2dd294ef903716a80135e6f4c',
+  'abseil_revision': '742a0ed42cf98b02bb71b89b8dda6569bb1fc417',
 
   'effcee_revision': '2c97e5689ed8d7ab6ae5820f884f03a601ae124b',