[MPlayer-dev-eng] [PATCH] configure fix to allow expand commands

[eviv bulgroz]

On my system with -x expand command set, I  get the following:
$ set -x; ver=`(gcc -dumpversion ) 2>&1`; set +x
...

$ echo $ver
++ gcc -dumpversion 3.4.1

!!!
To get a proper $ver value you have to do instead:
$ set -x; ver=`(gcc -dumpversion) 2>/dev/null`; set +x
...

$ echo $ver
3.4.1

Here is a minimal fix to allow expand command in configure
Please apply, thanks,
Eviv



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