Merge branch 'jc/ll-merge-binary-ours'

"git merge -Xtheirs" did not help content-level merge of binary
files; it should just take their version.  Also "*.jpg binary" in
the attributes did not imply they should use the binary ll-merge
driver.

* jc/ll-merge-binary-ours:
  ll-merge: warn about inability to merge binary files only when we can't
  attr: "binary" attribute should choose built-in "binary" merge driver
  merge: teach -Xours/-Xtheirs to binary ll-merge driver

Documentation/gitattributes.txt

@@ -927,7 +927,7 @@ file at the toplevel (i.e. not in any subdirectory).  The built-in
 macro attribute "binary" is equivalent to:
 
 ------------
-[attr]binary -diff -text
+[attr]binary -diff -merge -text
 ------------
 
 

Documentation/merge-strategies.txt

@@ -32,13 +32,14 @@ ours;;
 	This option forces conflicting hunks to be auto-resolved cleanly by
 	favoring 'our' version.  Changes from the other tree that do not
 	conflict with our side are reflected to the merge result.
+	For a binary file, the entire contents are taken from our side.
 +
 This should not be confused with the 'ours' merge strategy, which does not
 even look at what the other tree contains at all.  It discards everything
 the other tree did, declaring 'our' history contains all that happened in it.
 
 theirs;;
-	This is opposite of 'ours'.
+	This is the opposite of 'ours'.
 
 patience;;
 	With this option, 'merge-recursive' spends a little extra time