Remove real type

[Don]

bearophile wrote:
> Walter Bright:
>> I agree. The only reason to use float or double is to save on storage.
> 
> A little D1 program, that I compile with LDC:

Here's the only point in the code where there's difference:

> FP = double:
> 	fstpl	16(%esp)
> 	movsd	24(%esp), %xmm0
> 	mulsd	16(%esp), %xmm0
> 	movsd	%xmm0, 4(%esp)
> 
> FP = real:
> 	fldt	16(%esp)
> 	fmulp	%st(1)
> 	fstpt	4(%esp)
> 
> 
> If you use the real type you are forced to use X86 FPU, that is very inefficient if used by LDC.

It looks OK to me in this example.