Comment the one case where we backtick git

There is only the one time we actually need the output of the local git
command, so comment it accordingly.

Someday, in the unknowable future, we'll use a proper Git library
instead of backticks and system() calls.

Author: todb

msfupdate

@@ -111,7 +111,7 @@ end
 
 ####### Since we're Git, do it all that way #######
 if is_git
-	out = `git remote show upstream`
+	out = `git remote show upstream` # Actually need the output for this one.
 	add_git_upstream unless $?.success? and out =~ %r{(https|git|git@github\.com):(//github\.com/)?(rapid7/metasploit-framework\.git)}
 
 	remote = @git_remote || "upstream"