Config setting should be used in git version check.

lib/tasks/gitlab/check.rake

@@ -668,8 +668,9 @@ namespace :gitlab do
 
   def check_git_version
     required_version = Gitlab::VersionInfo.new(1, 7, 10)
-    current_version = Gitlab::VersionInfo.parse(run("git --version"))
+    current_version = Gitlab::VersionInfo.parse(run("#{Gitlab.config.git.bin_path} --version"))
 
+    puts "Your git bin path is \"#{Gitlab.config.git.bin_path}\""
     print "Git version >= #{required_version} ? ... "
 
     if required_version <= current_version