Request for review: README-builds.html updates

[Dalibor Topic]

Hi,

Bringing the docs from OpenJDK 6 and OpenJDK 7 a bit more in line,
I offer you the following webrev for review, fixing  

6872735: Further update build readme for new platforms
6641691: Bring build readme's up-to-date

with one potential commit:

http://cr.openjdk.java.net/~robilad/6872735.7/webrev.00/

cheers,
dalibor topic
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