fix feholdexcept -- it needs to clear exceptions after saving environment

src/fenv/feholdexcept.c

@@ -3,5 +3,6 @@
 int feholdexcept(fenv_t *envp)
 {
 	fegetenv(envp);
+	feclearexcept(FE_ALL_EXCEPT);
 	return 0;
 }