scripts: coccicheck: use "grep -E" instead of "egrep"

The latest version of grep claims that egrep is now obsolete so the build
now contains warnings that look like:
        egrep: warning: egrep is obsolescent; using grep -E
fix this up by moving the vdso Makefile to use "grep -E" instead.

Cc: Julia Lawall <Julia.Lawall@inria.fr>
Cc: Nicolas Palix <nicolas.palix@imag.fr>
Cc: cocci@inria.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: gregkh

scripts/coccicheck

@@ -47,7 +47,7 @@ FLAGS="--very-quiet"
 # inspected there.
 #
 # --profile will not output if --very-quiet is used, so avoid it.
-echo $SPFLAGS | egrep -e "--profile|--show-trying" 2>&1 > /dev/null
+echo $SPFLAGS | grep -E -e "--profile|--show-trying" 2>&1 > /dev/null
 if [ $? -eq 0 ]; then
 	FLAGS="--quiet"
 fi