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Libevl use *-Wshadow=local* flags in config.mk. However this flag is
only valid when version >=7, otherwise gcc will complain :
"unrecognized command line option ‘-Wshadow=local’; did you mean
‘-Wshadow-ivar’?"
and compile will be failed.

This patch fix this probelm.
Signed-off-by: lio <liu.hailong6@zte.com.cn>
Signed-off-by: Philippe Gerum <rpm@xenomai.org>