bug#18942: 2.4.3: Unable to build universal on OS X

[Misty De Meo]

Hi,

I'm unable to get libtool 2.4.3 to build universally on OS X. It fails while calling lipo while attempting to build libltdl.la.

It looks like the `find` here is returning no files, which results in lipo being called with an output file but no input files: http://git.savannah.gnu.org/cgit/libtool.git/tree/build-aux/ltmain.in?id=5627a7f498e07a40b970c3a5ab5e74a5053e956f#n3243

This occurs when attempting to build universal i386/x86_64 for OS X 10.6 through 10.10, so it doesn't seem to be confined to a particular OS verison.

I've attached verbose build logs (with silent rules disabled); they're also accessible online here: https://gist.github.com/9a4212e9f453dfcc813a

Best,
Misty De Meo

01.configure
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02.make
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config.log
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