Re: fix the AC_USE_SYSTEM_EXTENSIONS regression.

[Eric Blake]

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According to Ralf Wildenhues on 7/31/2008 4:32 PM:
| Hi Eric,
|
| OK to simply revert
|
| commit 6add6e92a6136865763edddb9946a8d2469153bb
| Author: Eric Blake <address@hidden>
| Date:   Tue Sep 11 17:13:13 2007 +0000
|
|     Centralize all system extensions checks.

Unfortunately, now that 2.62 has been released, there are packages that
are relying on the new combined semantics (pretty much anything
gnulib-based), as well as packages that aren't expecting the combined
semantics (witness all the bug reports).  I don't think straight reversion
is an option because it would impact a different set of packages; rather,
we'll have to find a way to make both camps happy by keeping things
combined but resolving the barriers that got in the way of older usage
patterns.

- --
Don't work too hard, make some time for fun as well!

Eric Blake             address@hidden
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