RFR: fix broken links in README of jtreg

[qudongfang]

Hi,

I found two broken links in README and build.html 
<http://openjdk.java.net/jtreg/build.html>.

I think it'd be better to be fixed.

Could some help me with this?

webrev file link stored in google drive
<https://drive.google.com/open?id=1psnsSFkdEbtOlPqsoAYvYE4eyXsuEXVG>

-- 
Best regards,

QU DONGFANG

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