mk: hardened PWD check (deny symlinks)

we check if the first argument is "./mk" and bail if not,
which forces you to be in the xbmk work directory.

however, this check is flawed because symlinks were still
possible.

this patch prevents a same-named symlink "mk" pointing to
the real mk from being used.

this hardening is necessary, due to several built-in
assumptions inherent within the design of xbmk.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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