ldouble_wrappers: remove i386-specific optimization

It is deemed too unsafe. Quoting Timo:

If I'm building with "-fPIC -pg" it instruments all C functions with
profiler stuff which is called via PLT and causes EBX reloads
 --> crash

-fno-omit-frame-pointer is sometimes useful for profiling too
 --> crash

Also the upcoming -fsplit-stack will be broken by this too (that might
need additional uclibc support though).

And I'm pretty sure there's also other similar compiler features.
There's no predefined #defines in gcc for any of these.

What I'm trying to say that there are *numerous* situations when the
compiler can create stack frame for you without you ever knowing it. And
if you want to do a tail jump, you really should be doing it from .S
file where you control fully the prologue/epilogue code. (GCC naked
attribute does not seem to work on x86.)

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

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