bitbake: utils: Force bitbake to en_US.UTF-8 locale setting everywhere

Under python 3, if we spawn python processes, we need to have a UTF-8
locale, else python's file access methods will use ascii. You can't
change that mode once the interpreter is started so we have to ensure
a locale is set. Ideally we'd use C.UTF-8 since OE already forces the
C locale but not all distros support that and we need to set something.
Was tempted to choose en_GB so colour gets spelt correctly :).

This is in some ways pretty nasty, forcing it into the environment
everywhere however we only have a limited number of ways of making
everything work correctly and this beats having to add utf-8 encoding
to every file access command.

A similar change will be needed to bitbake.conf in OE.

(Bitbake rev: 8902c29638411d312e6fc4a197707e5742652e15)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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