Do not choke on FPEs in the gravity pair tests. The vectorized version does not handle it well.

tests/testPotentialPair.c

@@ -95,11 +95,6 @@ int main(int argc, char *argv[]) {
   unsigned long long cpufreq = 0;
   clocks_set_cpufreq(cpufreq);
 
-/* Choke on FPEs */
-#ifdef HAVE_FE_ENABLE_EXCEPT
-  feenableexcept(FE_DIVBYZERO | FE_INVALID | FE_OVERFLOW);
-#endif
-
   /* Initialise a few things to get us going */
 
   /* Non-truncated forces first */