Changes

utils: allow flags to be passed as strings on the command-line
All --*flags arguments can now be written as "foo,bar" instead of 5.
"foo" must be case-insensitive substring of existing flag names
(we error-out in case of multiple matches).
strcasestr doesn't seem very easy to get on windows, so we use
toupper()+strstr() instead.
Signed-off-by: Valentin Hoyet <valentin.hoyet@inria.fr>

utils/test: check stringified flags in lstopo tests
Signed-off-by: Valentin Hoyet <valentin.hoyet@inria.fr>

utils: check that all flags are handled in stringified parsing
Signed-off-by: Valentin Hoyet <valentin.hoyet@inria.fr>

utils/flags: force end-matching with $ at the end of flags
useful for disambiguating between distances_add flags
(one has its name included in the other)
Signed-off-by: Valentin Hoyet <valentin.hoyet@inria.fr> Signed-off-by:
Brice Goglin <Brice.Goglin@inria.fr>

utils/flags: don't use strtok
Our parsing is very simple, strcpsn is enough
(strsep isn't available on windows).
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>