Fix check for long double as float on clang ppc64le

[mborland]

Closes: #299

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.87%. Comparing base (78d2d26) to head (4ff5282).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #300   +/-   ##
========================================
  Coverage    94.87%   94.87%           
========================================
  Files           75       75           
  Lines         9039     9039           
========================================
  Hits          8576     8576           
  Misses         463      463           

---

Continue to review full report in Codecov by Harness.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 78d2d26...4ff5282. Read the comment docs.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.