[oe] [patch] v8 recipe

[Luke Kenneth Casson Leighton]

http://bugs.openembedded.org/show_bug.cgi?id=5486

this is a recipe for a stand-alone libv8 _not_ as part of chromium.
it's part of an ongoing effort to get webkit dfb and other webkit
builds to build with v8 on ARM.  it depends on #5485.

l.