Remove -fshort-double (PR60410)

[Bernd Schmidt]

This patch fixes PR60410 by removing -fshort-double. Nick earlier 
propsed a fix for the crash, but Richard B suggested removing the option 
entirely, and I'd agree with that. It's a pointless ABI-changing option 
on most targets, and if a port really needs it, it should be a -m option 
that tweaks DOUBLE_TYPE_SIZE.

It turns out that there is still a mips config that enables it for a set 
of multilibs. As mentioned here:
   https://gcc.gnu.org/ml/gcc-patches/2016-01/msg02140.html
I've not managed to make that config build, it fails configuring libgcc. 
A mips maintainer would have to speak up as to whether that config is 
useful at all or not.

In any case, the patch below was bootstrapped and tested on 
x86_64-linux. Ok?


Bernd

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