Specify language  options for suppressing clang warnings.
Specify language  options for suppressing clang warnings.

Without this, clang complains:

"warning: treating 'c' input as 'c++' when in C++ mode, this
behavior is deprecated"

lemire/StronglyUniversalStringHashing,lemire/StronglyUniversalStringHashing,lemire/StronglyUniversalStringHashing