Pull up following revision(s) (requested by gson in ticket #296):
	tests/lib/libm/t_exp.c: revision 1.8
In the exp2_values test case, provide separate expected return values
for the float case, reflecting the actual exp2f() argument value after
rounding to float precision.  Fixes PR lib/49256.  Thanks to Makoto
Kamada and Tetsuya Isaki for the analysis.
Ticket #296