fenv-exceptions-tracking-c99 tests: Enhance tests. * tests/test-fenv-except-tracking-3.sh: Test not only FE_INVALID, but also FE_DIVBYZERO, FE_OVERFLOW, FE_UNDERFLOW, FE_INEXACT. * tests/test-fenv-except-tracking-3.c: Include <stdlib.h>, <string.h>. Don't include fpe-trapping.h. Assume HAVE_FPE_TRAPPING is 1. (main): Receive the exception to test as first argument.