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

[Szabolcs Nagy]

The new generic expf and exp2f code don't need wrappers any
more, they set errno inline, so only use the wrappers on
targets that need it. (The top level wrapper code is included
into sysdeps dirs where the wrapper is needed and empty
w_exp*f.c where the wrapper is suppressed).

A powerpc64 expf implementation includes the expf c code
directly which needed some changes.

2017-09-13  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* sysdeps/ieee754/flt-32/e_exp2f.c (__exp2f): Define without wrapper.
	* sysdeps/ieee754/flt-32/e_expf.c (__expf): Likewise
	* sysdeps/ieee754/flt-32/w_exp2f.c: New file.
	* sysdeps/ieee754/flt-32/w_expf.c: New file.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/e_expf-ppc64.c: Update for
	the new expf code.
	* sysdeps/powerpc/powerpc64/fpu/multiarch/w_expf.c: New file.
	* sysdeps/m68k/m680x0/fpu/w_expf.c: New file.
	* sysdeps/i386/fpu/w_exp2f.c: New file.
	* sysdeps/i386/fpu/w_expf.c: New file.
	* sysdeps/i386/i686/fpu/multiarch/w_expf.c: New file.
	* sysdeps/x86_64/fpu/w_expf.c: New file.
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