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>

t/lib-read-tree-m-3way.sh

@@ -87,7 +87,7 @@ test_expect_success \
 test_expect_success \
     'recording branch A tree' \
     'tree_A=$(git-write-tree)'
-	   
+
 ################################################################
 # Branch B
 # Start from O