War on whitespace

This uses "git-apply --whitespace=strip" to fix whitespace errors that have
crept in to our source files over time.  There are a few files that need
to have trailing whitespaces (most notably, test vectors).  The results
still passes the test, and build result in Documentation/ area is unchanged.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

commit.h

@@ -66,7 +66,7 @@ extern unsigned long pretty_print_commit(enum cmit_fmt fmt, const struct commit
 /** Removes the first commit from a list sorted by date, and adds all
  * of its parents.
  **/
-struct commit *pop_most_recent_commit(struct commit_list **list, 
+struct commit *pop_most_recent_commit(struct commit_list **list,
 				      unsigned int mark);
 
 struct commit *pop_commit(struct commit_list **stack);