Add Floating Point Equality Tests to Build List (#812)

#773 added a test utility that checks floating point equality based on ULP difference. However, as a blinded file checkout in #786, the line that builds tests for the floating point utility is removed by mistake. This PR adds that back.

Authors:
  - Michael Wang (https://github.com/isVoid)

Approvers:
  - Mark Harris (https://github.com/harrism)

URL: #812

cpp/tests/CMakeLists.txt

@@ -110,6 +110,10 @@ ConfigureTest(TRAJECTORY_BOUNDING_BOXES_TEST
 ConfigureTest(SPATIAL_WINDOW_POINT_TEST
     spatial_window/spatial_window_test.cpp)
 
+ConfigureTest(UTILITY_TEST
+    utility_test/test_float_equivalent.cu
+)
+
 # Experimental API
 ConfigureTest(HAVERSINE_TEST_EXP
     experimental/spatial/haversine_test.cu)