Fix spelling errors in no-longer-updated-from-upstream modules

We have several modules originally taken from some upstream source,
and which as far as I can tell we no longer update from the upstream
anymore.  As such, I have not submitted these spelling fixes to any
external projects but just include them directly here.

Reported-by: Jens Schleusener <Jens.Schleusener@fossies.org>
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/compat/regex/regex_internal.c b/compat/regex/regex_internal.c
index 59bf151..ec51cf3 100644
--- a/compat/regex/regex_internal.c
+++ b/compat/regex/regex_internal.c
@@ -1616,7 +1616,7 @@ free_state (re_dfastate_t *state)
   re_free (state);
 }
 
-/* Create the new state which is independ of contexts.
+/* Create the new state which is independent of contexts.
    Return the new state if succeeded, otherwise return NULL.  */
 
 static re_dfastate_t *