Preserve ordering of GNU ld library grouping flags

[Thomas Jahns]

Hello,

I noticed that libtool unfortunately puts -Wl,--start-group -Wl,--end-group and 
their short-hands -Wl,-( and -Wl,-) into an early position in the argument list 
of the link command instead of the libraries they are meant to go with, i.e. as 
originally specified.

Having libraries with cyclic dependencies is nothing I advocate for, but I think 
projects using libtool should be able to support it in their dependencies if 
necessary for external reasons.

So I had a look at what ltmain.sh does and figured out what special handling was 
needed. The corresponding patch is quite simple and straigh-forward. So I hope 
it can be included with an upcoming release.

The attached patch is vs. the master branch of
git://git.savannah.gnu.org/libtool.git at commit 
08c5524fb24b923ad91c2bdca836f1eafa56fd6c
which I hope is the correct place to use.

Regards, Thomas

0001-Fix-handling-of-flags-for-GNU-ld-library-grouping.patch
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