script/checkpatch.pl: warn about deprecated use of EXTRA_{A,C,CPP,LD}FLAGS

script/checkpatch.pl: warn about deprecated use of EXTRA_{A,C,CPP,LD}FLAGS

Usage of these flags has been deprecated for nearly 4 years by:

    commit 7623d29a844f94d45c464b05fdfe702e3e1b5cf5
    Author: Sam Ravnborg <sam@neptun.(none)>
    Date:   Mon Oct 15 22:25:06 2007 +0200

        kbuild: introduce ccflags-y, asflags-y and ldflags-y

Moreover, these flags (at least EXTRA_CFLAGS) have been documented for command
line use. By default, gmake(1) do not override command line setting, so this is
likely to result in build failure or unexpected behavior.

Warn about their introduction in Makefile or Kbuild files.

Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Andy Whitcroft <apw@canonical.com>
Signed-off-by: Arnaud Lacombe <lacombar@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>