RFR: JDK-8200867 Remove references to "jdk 9" in build system

[Tim Bell]

Magnus-

On 05/25/18 04:23, Claes Redestad wrote:
> On 2018-05-25 12:06, Magnus Ihse Bursie wrote:
>> WebRev:
>> http://cr.openjdk.java.net/~ihse/JDK-8200867-remove-jdk9-references/webrev.01
>>
>
> Looks good to me!
>
> /Claes

doc/building.md
doc/building.html

These files also have changes to minimum gcc versions 
(4.7/4.8/4.9.2/7.3.0) - is that for a different bug number?

Looks good to me otherwise.

/Tim