5224 snprintf rounding under [default] FE_TONEAREST
Reviewed by: Keith Wesolowski <keith.wesolowski@joyent.com>
Approved by: Robert Mustacchi <rm@joyent.com>
	[illumos-gate merge]

commit 5a172a1e0f9068ec8db35fa123baecf7bd540eb5
    5224 snprintf rounding under [default] FE_TONEAREST