[PATCH 4/5 v4] Do not wrap expf and exp2f

[Joseph Myers]

OK.  I'd strongly encourage powerpc people to see whether there is any 
advantage to the power8 e_expf.S, or whether, possibly after tuning 
TOINT_* (and potentially any other details of the expf implementation that 
can be tuned for different architectures at the C level), it's at least as 
good just to build the C version for power8.

-- 
Joseph S. Myers
joseph@codesourcery.com