updatemanpages.pl: error out on too old git version

#                            | (__| |_| |  _ <| |___

#                             \___|\___/|_| \_\_____|

#

# Copyright (C) 1998 - 2016, Daniel Stenberg, <daniel@haxx.se>, et al.

# Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.

#

# This software is licensed as described in the file COPYING, which

# you should have received as part of this distribution. The terms

  printargs();

}

# check to see that the git command works, it requires git 2.6 something

my $gitcheck = `git log -1 --date="format:%B %d, %Y" $dirlist[0] 2>/dev/null`;

if(length($gitcheck) < 1) {

    print "git version too old or $dirlist[0] is a bad argument\n";

    exit;

}

# Look in each directory.

my $dir_handle;