utils: Fix create_wrapper

Wrappers generated by create_wrapper do not work properly:
python, for example, looks at argv[0] to know if it is
running from a virtualenv. Because the wrapper replaces
argv[0] with python's canonical path, python cannot tell
whether it has been invoked directly or from a virtualenv
symlink.

This change makes the wrapper pass the original argv[0] down
to the real command.

(From OE-Core rev: 791e5bfcb449024f295a4f8f507c1012cff76f9d)

Signed-off-by: Achille Fouilleul <achille.fouilleul@gadz.org>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/utils.bbclass

@@ -264,7 +264,7 @@ create_wrapper () {
 realpath=\`readlink -fn \$0\`
 realdir=\`dirname \$realpath\`
 export $exportstring
-exec -a \`dirname \$realpath\`/$cmdname \`dirname \$realpath\`/$cmdname.real "\$@"
+exec -a "\$0" \$realdir/$cmdname.real "\$@"
 END
 	chmod +x $cmd
 }