Bash: remove custom MAN_PATH
Bash: remove custom MAN_PATH

All the machines I work on now have a sane MAN_PATH (eg. via
/private/etc/man.conf or /etc/man.config), so there's no need to
explictly set this up any more.

Signed-off-by: Wincent Colaiuta <c76ac2e9cd86441713c7dfae92c451f3e6d17fdc@wincent.com>

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