Expose all math *l functions as aliases for the * functions when long double == double

[Steve Kargl]

On Fri, Dec 28, 2018 at 09:00:36AM -0600, Justin Hibbits wrote:
> On Thu, 27 Dec 2018 14:15:23 -0800
> Steve Kargl <sgk at troutmask.apl.washington.edu> wrote:
> 
> > On Thu, Dec 27, 2018 at 04:09:37PM -0600, Justin Hibbits wrote:
> > > When building editors/calligra on powerpc64 it failed with undefined
> > > references to erfl and erfcl.  Some digging it turns out that these
> > > functions aren't being exposed as weak symbols in libm on platforms
> > > where long double is 64 bits, because LDBL_MANT_DIG is not defined
> > > in the files defining these functions.  The attached patch fixes
> > > that case.  It's only been compile-tested for powerpc64, but should
> > > have no negative impact on any other platform.
> > > 
> > > - Justin  
> > 
> > Looks OK to me.
> > 
> 
> Thanks Steve.  I figured there would be no issue, but since this is
> listed in MAINTAINERS, better to avoid a possibility of post-commit
> backlash.
> 

I'm actually surprised that it took 7 years, 9 months to discover
the issue with cbrtl() and 4 years, 5 months with erfl().

-- 
Steve