build: add basic mips/mipsel support
build: add basic mips/mipsel support

Extend the configure script so that it knows how to generate build files
for mips and mipsel.  Actually building io.js is pending MIPS buildbots.

PR-URL: https://github.com/iojs/io.js/pull/1045
Reviewed-By: Rod Vagg <f9f03903429036ef609ed7ca822fddfa76155c29@vagg.org>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node