Makefile: Do not pass MTD_VERSION from the top Makefile
$(MTD_VERSION) is used in tools/env/Makefile
If you specify a variable at a command line like:
$ make MTD_VERSION=old env
or specify it thru an envrionment variable like:
$ export MTD_VERSION=old
$ make env
it is inherited to the sub-make too.
We do not need to pass it from the top Makefile explicitely.
Signed-off-by: NMasahiro Yamada <yamada.m@jp.panasonic.com>
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