Remove dead variables and functions (#1238)

These were identified using Clang's -Wunused warning flag.

Signed-off-by: Marco Antognini <marco.antognini@arm.com>

test_conformance/math_brute_force/binary_float.cpp

@@ -279,7 +279,6 @@ int TestFunc_Float_Float_Float(const Func *f, MTdata d, bool relaxedMode)
     float maxError = 0.0f;
     double maxErrorVal = 0.0;
     double maxErrorVal2 = 0.0;
-    int skipTestingRelaxed = 0;
 
     logFunctionInfo(f->name, sizeof(cl_float), relaxedMode);