debian/rules: set INSTALL, TAR, SANE_TOOL_PATH explicitly in OPTS
Dyson (Debian on Illumos, http://osdyson.org) has `uname -s` = SunOS
and `uname -o` = Solaris so there is no easy way for the git
makefile to distinguish it for a more typical OpenSolaris system.
So it automatically gets settings
SANE_TOOL_PATH = /usr/xpg6/bin:/usr/xpg4/bin
INSTALL = /usr/ucb/install
TAR = gtar
which are not appropriate for a Debian system (and, in the case of
$(INSTALL) and $(TAR), break the build).
Reported-by: Игорь Пашев <pashev.igor@gmail.com>
Signed-off-by: Jonathan Nieder <jrnieder@gmail.com>