[Buildroot] [RFC/PATCH 1/3] fix buildroot sed handling on Mac OS X

[Heikki Lindholm]

Improve the checking of sed by adding some common GNU sed installation
names (gsed/gnused), checking for a basic OS X sed feature in command
line option handling, checking the actual result of the sed run against
the expected result, and placing common code for the check under
toolchain/dependencies/.

-- Heikki Lindholm

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