disabled c99 in Solaris builds

[Kim Barrett]

> On Dec 12, 2018, at 9:11 AM, Magnus Ihse Bursie <magnus.ihse.bursie at oracle.com> wrote:
> 
> 
> 
> On 2018-12-12 14:29, Baesken, Matthias wrote:
>>> I'd recommend a separate change to remove the -xc99=%none%. That's
>>> trivial and can be done immediately, to the benefit of everyone. Getting
>>> C++14 working is not happening quickly.
>> Ok, do you prefer just removing the old setting or setting
>> 
>> https://docs.oracle.com/cd/E37069_01/html/E37074/bjapp.html#OSSCGgnjmw
>> 
>> –std=value  (–std=c99)
>> 
>> ?
>> 
>> Best regards, Matthias
> Erm, I don't know. :-) No preference, really. But setting -std=c99 is fine, I think.

We’re also currently using -Xa, which is incompatible with -std=<anything>.
(That one is also being removed by the changes for C++14 support.)