gitweb: Use list for of open for running git commands, thorougly.
Use list form of open for running git commands and reading their
output through pipe, for example
open my $fd, "-|", $GIT, "rev-list", "--header", "--parents", $hash
instead of
open my $fd, "-|", "$GIT rev-list --header --parents $hash"
Single letter options use ' instead of " as quotes, according to style
used in list form of magic "-|" open.
Signed-off-by: Jakub Narebski <jnareb@gmail.com>
Signed-off-by: Junio C Hamano <junkio@cox.net>