[freebsd91p7][env] Merge remote-tracking branch 'origin/cygwin' into merging

Through git diff and git apply.
[freebsd91p7][env] Merging with origin/cygwin again.

Compared with origin/cgwin again, and find some difference need to be
changed.
[freebsd91p7][env] Remove LANG environment in .bashrc.

This configuration does not work on my freebsd92p7. Mark it so that at
least, tar will not show error message as "tar: Failed to set default
locale".