Fixed locale environment variables for macOS

Pete requested to merge pete/firmware:fix/build-macosx into master

Build on macOS creates a broken image because /bin/tr observes locale settings for LANG, LC_ALL, LC_CTYPE, LC_COLLATE (according to the tr manpage).

There was a previous fix that sets LANG and LC_CTYPE, but if e.g. LC_ALL is set to en_us.UTF8 the build process still produces a broken image. This fix sets LC_ALL and LC_COLLATE to C as well so a working image is built.

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