[OE-core] flex wrapper returns wrong version

[Martin Jansa]

Flex wrapper was added with:
commit d835488c526aa61163ade503c6586eaa59509a07
Author: Kevin Tian <kevin.tian at intel.com>
Date:   Wed Jan 5 10:26:36 2011 +0800

    flex-native: create a wrapper script for sstate installation

    flex-native encodes M4 staging path in its binary, which breaks sstate
    installation in a new build environment. Use create_wrapper to create
    a wrapper script which explicitly set M4 environmental variable to the
    new path

and --version returns `basename $0` --version, so in my case:
sysroots/x86_64-linux/usr/bin/flex --version
flex.real 2.5.35

Which isn't parsed correctly e.g. in newer webkit
|   Could NOT find FLEX: Found unsuitable version "flex.real 2.5.35", but
|   required is at least "2.5.34" (found
|   /OE/shr-core/tmp-eglibc/sysroots/x86_64-linux/usr/bin/flex)

we can probably work around it by changing regexp in
/sysroots/x86_64-linux/usr/share/cmake-2.8/Modules/FindFLEX.cmake

but it would be nice to fix it in flex.

Cheers,
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