Merge branch 'maint-1.5.1' into maint

* maint-1.5.1:
git-status: respect core.excludesFile
SubmittingPatches: mention older C compiler compatibility
git-daemon: don't ignore pid-file write failure

diff --cc Documentation/SubmittingPatches
Simple merge

diff --cc Documentation/config.txt
Simple merge

diff --cc wt-status.c
index a0559905a0b7072f4a4b44ea321c1316cfc84414,f053c15ffe266d9925379a71781bdacd56fcea26..4bfe8f15d8a0e275f1ed2d2458cda4d592f7c630
--- 1/wt-status.c
--- 2/wt-status.c
+++ b/wt-status.c
@@@ -259,8 -260,10 +260,10 @@@ static void wt_status_print_untracked(s
        x = git_path("info/exclude");
        if (file_exists(x))
                add_excludes_from_file(&dir, x);
+       if (excludes_file && file_exists(excludes_file))
+               add_excludes_from_file(&dir, excludes_file);
  
 -      read_directory(&dir, ".", "", 0);
 +      read_directory(&dir, ".", "", 0, NULL);
        for(i = 0; i < dir.nr; i++) {
                /* check for matching entry, which is unmerged; lifted from
                 * builtin-ls-files:show_other_files */