Bug#854715: remove spurious lines from grub-install [patch]

[積丹尼 Dan Jacobson]

How about now?
# env - /usr/sbin/grub-install --help | grep -n Usage
1:Usage: grub-install [OPTION...] [OPTION] [INSTALL_DEVICE]
51:      Usage: grub-install [OPTION...] [OPTION] [INSTALL_DEVICE]
# env - locale
LANG=
LANGUAGE=
LC_CTYPE="POSIX"
LC_NUMERIC="POSIX"
LC_TIME="POSIX"
LC_COLLATE="POSIX"
LC_MONETARY="POSIX"
LC_MESSAGES="POSIX"
LC_PAPER="POSIX"
LC_NAME="POSIX"
LC_ADDRESS="POSIX"
LC_TELEPHONE="POSIX"
LC_MEASUREMENT="POSIX"
LC_IDENTIFICATION="POSIX"
LC_ALL=