Fix VS2013 quirk.
Fix VS2013 quirk.

google/benchmark,codygray/benchmark,disconnect3d/benchmark,efcs/benchmark,disconnect3d/benchmark,mockingbirdnest/benchmark,efcs/benchmark,google/benchmark,everbase/benchmark,everbase/benchmark,codygray/benchmark,mockingbirdnest/benchmark,everbase/benchmark,google/benchmark,mockingbirdnest/benchmark,everbase/benchmark,mockingbirdnest/benchmark,efcs/benchmark,disconnect3d/benchmark,efcs/benchmark,codygray/benchmark,codygray/benchmark,disconnect3d/benchmark