[build, libjava] Ignore IRIX 6.5 ld warning for --no-merge-exidx-entries (PR libgcj/44216)

[Rainer Orth]

Rainer Orth <ro@CeBiTec.Uni-Bielefeld.DE> writes:

> Currently, the whole libjava testsuite fails on IRIX 6.5: the vendor
> linker doesn't recognize --no-merge-exidx-entries, but warns about the
> unknown option with no way to turn the warning into an error.  To work
> around this, I'm turning on AC_LANG_WERROR for the
> --no-merge-exidx-entries configure test, which fixes the problem.
> Unfortunately, as of autoconf 2.64 there's no documented way to turn
> AC_LANG_WERROR off again, so I'm using a code snippet from AC_PATH_XTRA
> to do so.
>
> Bootstrapped on mips-sgi-irix6.5, approved by Paolo in the PR,
> installed.

While checking in another libjava patch, I noticed that the 4.4 and 4.5
branches are affected as well.  Ok for both if testing passes?

4.5 should be identical since it uses autoconf 2.64, too.  I'll have to
be extra careful on 4.4 where autoconf 2.59 is still in use, maybe
copying a different snippet from AC_PATH_XTRA if that changed.

	Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University