Reuse math_brute_force ulp threshold in spir test

Spir test compares floating-point kernel results bit-by-bit with
correct results. However, for math_brute_force kernels, specification
does not ask for SPIR and OpenCL C path to match bit-to-bit. This patch
reuses ulps threshold from math_brute_force folder for math_brute_force
kernels in spir test.

Signed-off-by: Wenju He <wenju.he@intel.com>

test_conformance/spir/CMakeLists.txt

@@ -4,13 +4,17 @@ endfunction()
 
 include_directories(${CLConf_SRC_DIR}/test_common)
 
+# Import function list from math_brute_force
+add_definitions(-DFUNCTION_LIST_ULPS_ONLY)
+
 clconf_add_executable(
     test_spir
     main.cpp
     datagen.cpp
     run_build_test.cpp
     run_services.cpp
-    kernelargs.cpp)
+    kernelargs.cpp
+    ../math_brute_force/FunctionList.c)
 
 target_link_libraries(
     test_spir${CLConf_SUFFIX}