Fix underflow reporting and tie up loose ends in sparc soft-fp.

Fix underflow reporting and tie up loose ends in sparc soft-fp.

	* sysdeps/sparc/sparc32/soft-fp/q_util.c (___Q_numbers): Delete.
	(___Q_zero): New.
	(__Q_simulate_exceptions): Return void.  Change to simulate
	exceptions by writing into the %fsr.
	* sysdeps/sparc/sparc64/soft-fp/qp_util.c
	(__Qp_handle_exceptions): Likewise.
	(numbers): Delete.
	* sysdeps/sparc/sparc64/soft-fp/Versions: Remove entry for
	__Qp_handle_exceptions.
	* sysdeps/unix/sysv/linux/sparc/sparc64/nptl/libc.abilist: Remove
	__Qp_handle_exceptions.
	* sysdeps/sparc/sparc32/soft-fp/sfp-machine.h (_FP_DECL_EX): Mark
	as unused and give dummy FP_RND_NEAREST initializer.
	(FP_INHIBIT_RESULTS): Define.
	(___Q_simulate_exceptions): Update declaration.
	(FP_HANDLE_EXCEPTIONS): Use ___Q_zero and tidy inline asm
	formatting.
	* sysdeps/sparc/sparc64/soft-fp/sfp-machine.h (_FP_DECL_EX): Mark
	as unused and give dummy FP_RND_NEAREST initializer.
	(__Qp_handle_exceptions): Update declaration.
	(FP_HANDLE_EXCEPTIONS, QP_NO_EXCEPTIONS): Tidy inline asm
	formatting.