New test for ftime

This test verifies the sanity of ftime and exposes bugs such as BZ

2014-09-17  Arjun Shankar  <arjun.is@lostca.se>

	* time/tst-ftime.c: New test.
	* time/Makefile (tests): Add tst-ftime.
stdlib/longlong.h: Add __udiv_w_sdiv prototype.