recipetool: create: add license file crunching

Matching license texts directly to md5sums only goes so far. Some
licenses make the copyright statement an intrinsic part of the license
statement (e.g. MIT) which of course varies between projects. Also,
people often seem to take standard license texts such as GPLv2 and
reformat them cosmetically - re-wrapping lines at a different width or
changing quoting styles are seemingly popular examples. In order to
match license files to their actual licenses more effectively, "crunch"
out these elements before comparing to an md5sum. (The existing plain
md5sum matching has been left in since it's a shortcut, and our list of
crunched md5sums isn't a complete replacement for it.)

As always, this code isn't providing any guarantees (legal or otherwise)
that it will always get the license correct - as indicated by the
accompanying comments the LICENSE values it writes out to the recipe are
indicative and you should verify them yourself by looking at the
documentation supplied from upstream for the software being built if you
have any concerns.

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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