Bin obsolete conditional compilation

NO_FALLBACK_TO_SWINTERP has been undefined for a long time. I doubt anybody
knows any more what it means, and in what situations it might perhaps make
sense to define it. Should it be a compile-time choice anyway, in that case,
or a run-time one? What is a "TDD run"? Test-Driven Development? But we have
our unit test mechanism for that.

Change-Id: If3e21e958ebeb689a8aac8eb7393c02f7143401c

sc/source/core/opencl/formulagroupcl.cxx

@@ -81,8 +81,6 @@ const unsigned long __nan[2] = {0xffffffff, 0x7fffffff};
 #include <boost/scoped_ptr.hpp>
 #include <boost/scoped_array.hpp>
 
-#undef NO_FALLBACK_TO_SWINTERP /* undef this for non-TDD runs */
-
 using namespace formula;
 
 namespace sc { namespace opencl {
@@ -3656,12 +3654,8 @@ DynamicKernel* DynamicKernel::create( ScTokenArray& rCode, int nResultSize )
     catch (const UnhandledToken& ut)
     {
         SAL_WARN("sc.opencl", "Dynamic formula compiler: unhandled token: " << ut.mMessage << " at " << ut.mFile << ":" << ut.mLineNumber);
-#ifdef NO_FALLBACK_TO_SWINTERP
-        assert(false);
-#else
         delete pDynamicKernel;
         return NULL;
-#endif
     }
     catch (...)
     {