lang/ruby2* build failure on arm

[Michael Moll]

On Fri, Nov 20, 2015 at 11:18:09PM +0100, Dimitry Andric wrote:
> As to why GNU configure tries to call this without arguments, is beyond
> me.  To work around its brokenness, I would set ac_cv_func__setjmp to
> yes before calling configure.  Or attempt to unbreak autoconf, but that
> is a truly Herculean task. :-)

Tested and committed as r402110, thank you very much!
-- 
Michael Moll
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